Justin Bieber hits the stage with will.i.am for their performance at the 2013 Billboard Music Awards held at the MGM Grand Garden Arena on Sunday (May 19) in Las Vegas.

The 19-year-old singer and will performed their song “#thatPOWER” and showed off their dance skills during the performance.

PHOTOS: Check out the latest pics of Justin Bieber

“2 performances and 2 awards. Grateful to my #Beliebers . Our awards. Love u,” Justin later tweeted.

Check out the video of Justin and will.i.am‘s performance below!

FYI: Justin and Will are wearing custom Ashton Michael looks.

15+ pics inside of Justin Bieber on stage… More Here! »

Seems like Taylor Swift wasn’t too impressed with her BFF Selena Gomez giving her on-and-off boyfriend Justin Bieber a kiss backstage at the 2013 Billboard Music Awards held at the MGM Grand Garden Arena on Sunday (May 19) in Las Vegas.

The 23-year-old entertainer was spotted sticking out her tongue while glancing over at the duo giving each other a kiss on the cheek. Watch the GIF below!

WHAT DO YOU THINK of Taylor sticking out her tongue?

Taylor Swift Sticks Out Tongue for Selena Gomez & Justin Bieber’s Kiss

Selena Gomez gives her on-and-off-again boyfriend Justin Bieber a kiss on the cheek while meeting up backstage at the 2013 Billboard Music Awards held at the MGM Grand Garden Arena on Sunday (May 19) in Las Vegas.

The 20-year-old singer/actress and the 19-year-old singer both performed at the show that evening and were rumored to sit together during the telecast.

Selena and Justin‘s meetup was captured on Billboard’s backstage feed after the show. Check out the video below to see the meeting.

DO YOU THINK Selena Gomez and Justin Bieber are back together?

Justin Bieber makes a grand entrance at the 2013 Billboard Music Awards held at the MGM Grand Garden Arena on Sunday night (May 19) in Las Vegas.

The 19-year-old singer performed his song “Take You” during the show and then picked up the award for Top Male Artist.

PHOTOS: Check out the latest pics of Justin Bieber

“Rehearsal looked good. 2 performances tonight . Make sure to watch. #BillboardAwards,” Justin tweeted just before the show. Watch his performance below!

20+ pics inside of Justin Bieber…

More Here! »

Justin Bieber stops by a convenience store to pick up a few snacks on Thursday afternoon (May 16) in West Hollywood, Calif.

The 19-year-old singer was joined by his good friend Lil Twist.

PHOTOS: Check out the latest pics of Justin Bieber

“Justin would be awesome,” Carly Rae Jepsen recently told The Hollywood Reporter about him filling a judge’s spot on American Idol. “He’s got lots of great opinions when it comes to the music world and he’s very experienced especially for being so young.”

10+ pics inside… More Here! »

Selena Gomez lays her head on Justin Bieber‘s shoulder in this just-posted pic from Instagram.

“‘You’ve been makin music for too long babe come cuddle’ -her,” Justin, 18, captioned with the image.

PHOTOS: Check out the latest pics of Justin Bieber

Just last week, Selena made a trip to Sweden to visit Justin on tour in Europe.

Justin just performed in Finland tonight. “#Helsinki is ready . #BELIEVEtour,” he wrote earlier on Twitter.

TELL JJJ: Do you think Justin and Selena are officially back together?

Liam Hemsworth hops out of his car on his way to the gym for a workout on Thursday afternoon (April 25) in Beverly Hills, Calif.

The 24-year-old actor’s fiance Miley Cyrus recently appeared in The Real Change Project TV special, alongside her friend Justin Bieber.

PHOTOS: Check out the latest pics of Miley Cyrus

The special follows musicians who sponsor classrooms and go back to their hometown schools to introduce the teachers who inspired them and surprise the students.

Watch Miley and Justin in The Real Change Project video below!

10+ pics inside of Liam Hemsworth at the gym… More Here! »