When Kim Kardashian's post-pregnancy butt went viral it sparked a booty photo shoot frenzy amongst celebrities including Lady Gaga and Kelly Brook.
Rihanna was never going to be far behind this booty trend (you could say she started it long ago!) but she had a lot of making up to do if she was going to compete with Miss K's white swimsuit snap.
The 25-year-old singer posted a series of sizzling swimwear snaps to her Instagram account, lounging by a pool in the Dominican Republic.
There's no time for kicking back when you're on holiday with a photo fanatic. Rihanna roped her photographer pals into a snapping session - what else are bikinis for?
Rihanna posed in a tiny pink and yellow triangle bikini which she teamed with a handful of midi rings and large hoop earrings.
In one poolside shot she arches her back and sticks out her assets as she sprawls herself across the tiles in her sexy two piece - her hair styled to wet-look perfection.
Showing off all of her tattoos and her enviable abs (hello, the tour is paying off!) Ri-Ri proves nothing but photogenic in every shot.
Taking bod shots is nothing new but dropping the lens south and zooming in on your derrière - that's something that's suddenly become very in vogue.
But who's the ringleader behind this cheeky campaign for scantily clad buttocks, maybe it was Miley Cyrus with her near-naked twerking, Beyonce and her bootilicious Destiny's Child days or Kylie Minogue and her hot gold hotpants?
One thing's for sure, the butt trend is back in fashion and it's showing no signs of fatigue!
Check out these celebrity bums in the gallery below
Who would win in the battle of the butts? Tweet us @sofeminineuk!