Sexy Celebrity Selfies: See Justin Bieber, Selena Gomez, Rihanna + More [Pictures]

Thanks to social media outlets like Instagram and Twitter, we've been able to catch glimpses of some of the sexiest selfies from stars like Justin Bieber, Selena Gomez and, of course, Rihanna. Scroll through below to see some of the sexiest celebrity selfies from these pop singers and more, like Lady Gaga, One Direction, Demi Lovato and Austin Mahone.

Rihanna stripped down to her bare bottom in this nearly naked selfie. Below, you can see Rihanna's glorious tatas all free as she got ready for a performance.

Justin Bieber wanted to show all of his haters that he's been hitting the gym hard. With this shirtless selfie, we think Justin Bieber's mission was accomplished.

Selena Gomez isn't one for getting all sexy on social media, but she did post this sexy selfie of her lounging poolside in a bikini. Nice tush, Sel!

Nicki Minaj busted out her boobies for this tantalizing Twitter selfie. Earlier on, she worked it all over a pool deck in a thong bikini, showing off that famously huge rump of hers!

Carlos Pena and James Maslow of Big Time Rush are some seriously buff dudes. Check out Carlos Pena's shirtless selfie, which he took to show off his awesome new rib tattoo, and James Maslow's selfie, where he flexed his massive guns at the gym.

Beyonce is ready to go scuba diving, y'all! This absolutely beautiful 'Grown Woman' snapped this bikini selfie while vacationing with her family. She better be careful diving in, so that teeny tiny top doesn't go flying!

Ariana Grande is usually all hearts and flowers, but 'The Way' was feeling oh-so proud of her cute little behind one day, she had to snap this selfie. The super small-framed singer also talked about how important it is for people to embrace their own unique figures.

Austin Mahone doesn't look like a teenager in this shirtless selfie, that's for sure. The 'What About Love' heartthrob had all of his Mahomie's hearts fluttering when he posted this hot, shadowy pic during a workout session.

Miley Cyrus doesn't even need to show her face in order to look sexy in her selfies! The 'We Can't Stop' singer was teasing her new music video in June 2013, and posted these butt and cleavage-baring shots for her fans' enjoyment.

Jason Derulo has the closest thing to a perfect body that you can get. So, can you really blame the guy for posting this sexy shirtless shot on Instagram? He worked hard for that body, so he should be able to show it off!

Meanwhile, Jason Derulo's girlfriend, Jordin Sparks, was looking equally as hot as her significant other when she posted this bikini pic on Instagram. She's been workin' it hard at the gym, and likes to show her progress with fans to help motivate them. She's a great role model, that Jordin.

Kesha has gotten naked plenty of times, but her sexiest selfie surprisingly doesn't show off that much skin. Kesha snapped this pic while lying down in bed, giving her Animals a glimpse of her lacy bra and an insanely sultry bedroom stare.

Niall Horan of One Direction got shirtless after a haircut -- see that girl he's with? That's 1D's official hairdresser and makeup artist, Louise Teasdale. We bet Directioners would've killed to be in her spot when this shirtless picture of Niall began circulating.

Niall obviously isn't the only sexy guy in One Direction, however. Liam Payne was out boating with a friend one day when he snapped this shirtless selfie. Don't his arms and shoulders look awesome? And we love that smile!

Oh, Harry Styles. When will this super sexy selfie of you all naked in a blanket go away? The answer is never, and we like it that way, OK?!?!?

Demi Lovato doesn't need smoke and mirrors to look absolutely slammin' in a bikini! She's even nailed the classic pinup pose in this super sexy selfie.

Cody Simpson has such a hot body, that sometimes we forget he's so young and then we feel creepy. But whatever, look at the abs on the 'Pretty Brown Eyes' singer in this mirror selfie that Cody posted on Instagram. It doesn't get much better than that, right girls?

It's semi surprising that Christina Aguilera, the woman who has an album called 'Stripped' and has donned a--less chaps in the past, would be at her ultimate sexiest when she's a bit covered up! Check out this selfie she took -- it's Hollywood glam at its finest, and the silhouette of her curvy figure is stunning.

Jessie J is all about health of body and spirit, so naturally, we were so happy to see her posting these bikini selfies, looking super fit while taking a relaxing vacation at the beach.

Pump it up, Drake! How hot does the rapper look in this selfie, which he posted during a weight-lifting session? Those guns are not to be messed with!

How do we love thee, Britney Spears? Let us count the ways... One, she had the courage to post a makeup-free selfie while chillin' with her sons poolside. Second, she showed off her killer bikini body in the process. Third, she's just freakin' adorable, y'all! The list goes on, but we'll stop now.

Daaaaaang! Rita Ora looked smokin' while posing on the beach in this ridiculously sexy selfie. She was vacationing with friends in Dubai when she posted this picture of herself, lying on the beach showing off her amazing cleavage and curves.

Lady Gaga might have the sexiest of all the selfies, considering she went totally naked! OK, she's wearing some nude-colored panties, but still -- Mother Monster took it all off for her Little Monsters as she relaxed post-concert in her hotel room.