"It was pretty hot and heavy." Just 12 celebrity couples we completely forgot existed.

During the ’90s and early ’00s, it seemed as though all of Hollywood’s elite had dated one another. And that’s because yes, they basically did.

And although we remember plenty of them (think, Jennifer Lopez and Ben Affleck) there are many that we have since forgotten about.

WATCH: How celebrities are getting creative in isolation. Post continues below.

Until now.

So, to relive the glory days when our favourite celebrities got together (and stare at their questionable fashion choices), here are 12 celebrity couples that we completely forgot ever existed.

Laura Dern and Billy Bob Thornton

Although everyone remembers Billy Bob Thornton dating Angelina Jolie, before they got together he was with Academy Award winner, Laura Dern.

The couple met on the set of the Ellen sitcom in 1997, where Dern famously played DeGeneres' girlfriend in the "Coming Out" episode and Thornton guest-starred. The two went on to date for two years and even became engaged.

However, Thornton sadly moved onto Jolie and married her... while the pair were still together.

In a 2000 interview with Talk Magazine, Dern spoke about their breakup, citing it as a sudden death.

"I left our home to work on a movie, and while I was away, my boyfriend got married, and I've never heard from him again. It's like a sudden death. For no one has there been any closure or clarity," she shared.

Gwyneth Paltrow and Ben Affleck

Although both of these a-list celebrities were known to date other well-known actors, most people might've forgotten they dated each other. For three years.

The couple dated from 1997 to 2000 (just after Paltrow's long-term relationship and engagement to Brad Pitt ended) and starred in two movies together, Shakespeare in Love and Bounce. 

Unfortunately, the relationship didn't last.

When looking back on their relationship, Paltrow explained that she and Affleck were just too different.

“I just think we have a very different sort of value system. Ben makes life tough for himself. He’s got a lot of complication, and you know, he really is a great guy. So I hope he sorts himself out," she told Entertainment Weekly.

Kate Bosworth and Orlando Bloom

Before Orlando Bloom married Aussie supermodel Miranda Kerr, he dated Kate Bosworth from 2002 to 2005.

Bosworth has shared that since dating Bloom during his prime, she has sworn off actors altogether.

When appearing on Andy Cohen's late-night talk show, Watch What Happens Live With Andy Cohen, she explained the problem with dating actors.

"It's no bueno. It's just—it's too much of the same thing," Bosworth explained.

She continued by sharing that as Bloom was at the beginning of his Pirates of the Caribbean popularity (the first film was released in 2003), it became all too much.

"It hit when we were together," she recalled. "I think when you kind of go through something like that with someone, it's like you feel like that's a real anchor in many ways because it was just crazy. We would land at airports, and he would have, like, girls, like, lifting their shirts up... It was just wild.

"I mean, if you're just two normal people hanging out, and all of a sudden it just blows up into something really surreal, then you kind of look at the person you're with as a rock in many ways. And I think we felt that way about each other through a crazy time," she shared.

Salma Hayek and Edward Norton

Many of us might have forgotten that Hayek dated the Italian Job actor, but the couple were actually together for four whole years.

Sadly, there are little details on their relationship besides the fact that the pair worked on the film Frida together in 2002.

Tyra Banks and Seal

Although Tyra Banks is known for keeping her private life extremely private, there are photos to prove that her and the Kiss From A Rose singer did indeed date in the mid-'90s.

However, it was only brief and the two have since married others (hello, Seal and Heidi Klum).

Sarah Jessica Parker and Robert Downey Jr.

After meeting on the set of the 1984 film, Firstborn, Sarah Jessica Parker and Robert Downey Jr. dated for six years.

At the time, Downey Jr. told People, "I’m really happy with Sarah, and I don’t want to ruin it by planning too far ahead. But the way I feel now, marriage looks like where we’re headed".

However, due to Downey Jr's substance addiction, the two never made it to that next step.

"I was so selfish. I liked to drink, and I had a drug problem, and that didn’t jibe with Sarah Jessica, because it is the furthest thing from what she is.

"She provided me a home and understanding. She tried to help me. She was so miffed when I didn’t get my act together… I was in love with Sarah Jessica, and love clearly was not enough," he told Huffington Post.

Tom Cruise and Cher

Yes, this unlikely pair did date during the 80s. And, they met at none other than Sean Penn and Madonna’s wedding in 1985. Cher was 39, and Cruise was 23.

While Cher admitted to Andy Cohen on Watch What Happens Live with Andy Cohen, that it was only a brief fling, she did say that "it was pretty hot and heavy for a little minute," and she still considers Cruise one of her top five in bed.

Ryan Reynolds and Alanis Morissette

In 2002, Canadian actor Ryan Reynolds met seven-time Grammy Award-winner, Alanis Morissette, at Drew Barrymore's birthday party.

And by 2004, the two were engaged.

“[He's] like a soul brother to me, except that I want to jump his bones," Morissette said about their relationship.

While Reynolds shared, “I love her music... but it can be awkward when she walks in and I’m listening to it in my underwear dancing".

However, after a three-year engagement, the two sadly ended their relationship.

When discussing their split, Morrisette explained to the LA Times, "I've been on a constant journey toward finally surrendering and hitting the rock bottom that I've been avoiding my whole life... so this was a huge, critical juncture for me. Everything broke, and it was an amazing and horrifying time".

While Reynolds was quickly onto his next relationship, with non other than Scarlett Johansson.

Brad Pitt and Christina Applegate

Unfortunately, it was only one date to the 1989 MTV Movie Awards for Pitt and Applegate, but man, they made a good-looking couple.

Cameron Diaz and Justin Timberlake

Cameron Diaz and Justin Timberlake dated for almost four years, from 2003 to 2007.

The couple, who had an eight-year age gap, met at the Nickelodeon Kid's Choice Awards in 2003 and were known as one of the most popular celebrity couples during the period they dated.

However, they ended things in 2007.

There were rumours the reason they broke up was because of Timberlake allegedly cheating with Scarlett Johansson (she starred in his music video, What Goes Around Comes Around) however, nothing was ever confirmed.

Ryan Gosling and Sandra Bullock

Long before Ryan Gosling and Eva Mendes got together, he dated early '00s superstar, Sandra Bullock.

The pair met on the set of the 2002 psychological thriller Murder By Numbers, which they co-starred in.

Bullock (who was 37 in 2001) played a cop chasing a young rich kid played by Gosling (then 21), who she suspected of murdering a young girl.

The 16-year age gap turned a few heads at the time, and the pair remained pretty coy on their relationship.

But for the first time in 2011, Gosling spoke publicly about their relationship.

Speaking to The Times about his ex-girlfriends Bullock and Rachel McAdams he said, "I had two of the greatest girlfriend of all time. I haven't met anybody who could top them".

John Mayer and Jennifer Love Hewitt

Hewitt, the star of The Client List, dated John Mayer in 2002. Their relationship was widely talked about, as a rumour suggested his hit song, Your Body is a Wonderland, was written about her.

However, Jennifer later denied this, sharing that the song was in fact written before they met.

Melissa Joan Hart and Ryan Reynolds

Melissa Joan Hart and Ryan Reynolds met while working together on the Sabrina the Teenage Witch TV movie in 1995. Reynolds played one of Sabrina's crushes.

"He was very sweet," Hart told Studio 10.

Only, she had a boyfriend during their fling. 

"I had a boyfriend at the time but we were smitten and cute and he was adorable. He was a really, really nice guy. [He] probably would have been a great boyfriend, and I didn't end up with the other guy, so maybe I should have taken a chance."

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