Lady Gaga vs. Katy Perry: THG Bikini Body Summer Showdown!

In celebration of LITERALLY the hottest time of year, we're pleased to announce and kick off the 1st Annual THG Bikini Body Summer Showdown!

It's not a complicated setup. Take a look at the two bikini-clad celebrities pitted against each other below. Choose your favorite. The winner advances.

Yesterday's battle? Lindsey Vonn and Maria Sharapova. Today? A clash of pop titans, with Katy Perry and Lady Gaga competing for more than just Billboard's #1 spot.

Who will win this first-round matchup? Cast your vote below!

If you need do to more research before casting your virtual ballot, feel free to peruse THG's extensive galleries of Katy Perry photos and Lady Gaga photos.