Images: iStock

Lady Gaga and Jessie J have a few things in common: they’re both world famous, chart-smashing pop stars known for their out-there onstage antics and outfits.

As of this weekend, these two women have another similarity to add to the list: their hair.

The subtle Kim Kardashian hair change you didn’t notice.

Jessie J started it. On Friday, the Bang Bang singer graced Instagram with a photo of her new haircut. “Bob is back,” she declared.

Yes, Jessie. Yes it is.

Jessie’s had a longer version of the bob for a while, but this latest iteration is shorter and sharper.

The next day, Lady Gaga followed suit.

Over the years, the singer has worn some dramatic and downright bizarre hairstyles, so it was quite a surprise to see she'd swapped her long platinum extensions for a blunt black bob.

She captioned her post, "Love my new haircut". No chop regrets here, then.

Not sure about you, but we're kind of hoping these twin Velma Kelly-esque haircuts lead to a music collaboration between Gaga and Jessie. It's about time.

Sam Frost is a blonde bachelorette no more.

These aren't the only new celebrity hairstyles that have us talking - check out these A-list bobs, lobs and dye jobs:

The best celebrity hair transformations

Nicole Kidman

Rita Ora

Kylie Jenner

Kim Kardashian

Kerry Washington

Tammin Sursok

Nicole Ritchie

Julia Roberts.

Mindy Kaling

Mindy Kaling.

Nicole Ritchie

Audrina Patridge

Sia Furler

Kate Bosworth

Cara Delevingne

Jackie O.

Lisa Kudrow

Cara Delevingne

Lena Dunham

Zoe Foster Blake

Nat Bassingthwaighte

Bella Heathcote

Rosie Huntington-Whiteley

Claire Holt

Jess Hart

Jessica Mauboy

Elizabeth Olsen

Sarah Wilson

Gwen Stefani