The Week in Celeb Twitpics (PHOTOS)

Best Bikinis of 2012
See Lea & more in our best bikinis of 2012 gallery!
With the weather warming up, celebrities everywhere are stripping down!

This week, Selena Gomez, Ashley Tisdale, and Sports Illustrated covergirl Kate Upton all slipped into their itsy-bitsy bikinis and tweeted photos of their amazing beach bods. SelGo and Kate both stunned in skimpy two-pieces on set, while Ashley kicked back in Hawaii in cheeky swimwear.

But the ladies weren’t the only ones flaunting their toned tummies! Can you guess which Big Time Rush hunk gave us a peek at his fab abs when he debuted his new tattoo? Click through the gallery to find out!

Rihanna also heated up in the Twittersphere on Friday when she gave fans a behind-the-scenes peek at her new music video with Coldplay. She wrote on Twitter:

Check out more of RiRi’s sexiest Twitpics in the gallery below!