In fact, the teen twosome are so totally in love.
How do we know? Read on to find out...
Just last night, Bieber and Gomez hit up an A|X Armani Exchange store in NYC for some couples' retail therapy. "They both said 'I love you' to each other, but Justin said it first," a source tells us of the duo.
According to the source, they repeated the L-word many times while holding hands and stealing a few kisses. Selena even picked out some of the brand's Pima T-shirts for her man. (P.S.: Don't forget to check out the premiere of E! Special: Selena Gomez, tonight at 10 p.m. on E!)
In other celebrity sightings, Tobey Maguire celebrated his birthday at L.A.'s Campanile restaurant Monday night with a big group that included celeb pals like Leonardo DiCaprio, Kevin Connolly and Sarah Gilbert. The gang rolled in a little before 9 p.m. and got a private room in the back of the restaurant. At one point, Maguire was serenaded by the group with "For He's a Jolly Good Fellow."
Nicole Scherzinger celebrated her 33rd birthday in Las Vegas by lounging poolside at Marquee Dayclub at the Cosmopolitan and partying at Tao nightclub.