As many of us know, ex-boyfriends, girlfriends and partners are strictly off-limits to friends – but in the quirky corners of Hollywood, these rules don't always apply.

While we have a 'whole world' to explore when it comes to new relationships, celebrities are typically confined to a small circle of A-listers and socialites.

Watch MM Confessions: My Partner Doesn't Know... Post continues after video.

So, it's no surprise that there are quite a few celebs who are good pals and happen to share a former partner or two.

Here are the 10 celebrities who are seemingly totally okay with other celebs dating their exes.

Sienna Miller and Tom Sturridge... who may be dating Alexa Chung.

Fashion designer Alexa Chung and actor Tom Sturridge sparked dating rumours after they were spotted kissing at Wimbledon. Sturridge's ex, Sienna Miller. was just one row ahead with her partner, Oli Green.

The pair dated for a few years before splitting up in 2015, and share a nine-year-old daughter they named Marlowe.

Sienna and Tom seem to be on good terms, as photographers caught the group of four snapping selfies together.

While Alexa and Tom are yet to make an announcement about their relationship, this is the second time they've made a public appearance with one another after being photographed at Glastonbury Festival.

Miranda Kerr and Orlando Bloom... who is dating Katy Perry.

Before Orlando Bloom and Katy Perry, there was Orlando Bloom and Miranda Kerr.

While their days as husband and wife are no more, the pair have maintained a bond that some might find strange. Not only is the model still close to her ex, but she has also become friends with Perry.

"We hang out and enjoy each other’s company. I really love and appreciate Katy and [Orlando] really loves and appreciates Evan, which is great," Kerr told Marie Claire.

The former VS Angel has also since moved on and had children with Snap Inc. (including Snapchat) founder Evan Spiegel – and the two couples go out of their way to spend holidays and quality time together for their children.

Their children, as a breakdown, are as follows:

"Orlando and I are great friends, and I have so much respect and admiration for him as a person and father, but we’re so much better [as] friends than partners," Kerr said.

Demi Moore and Bruce Willis.

Bruce Willis married fellow actor Demi Moore in 1987 and together they share three daughters, Rumer, 33, Scout, 30 and Tallulah, 28.

While the pair divorced in 1998, they remained close friends. So much so that Willis went on to attend Moore's subsequent wedding with Ashton Kutcher in 2005.

Willis moved on as well, with Emma Heming Willis in 2009. The pair went on to have two more daughters, named Evelyn and Mabel.

Willis and Moore caused a stir when it was revealed both families chose to quarantine together during the pandemic – but for this blended family, it's normal.

When Emma Willis was asked byUS Weeklywhat her thoughts were on having her husband's ex-wife at their vow renewals, she said: "She welcomed me into her family as I welcomed her into ours. I have so much respect for how Bruce and Demi worked through their divorce to be able to put their children first.

"I learned so much from that and grew so much from watching that. It was important for her to be there."