Selena Gomez may still have the hots for Justin Bieber, but now we think we know the reason they initially broke up. Life & Style report after two years of dating Selena found out that Justin had cheated on her in the early stages of their relationship — with Rihanna.

At least Gomez didn’t revenge-date Chris Brown. The volatile singer was set to return to court Wednesday to face a prosecutor who is asking a judge to revoke his probation because investigators could not find credible evidence he completed his community labor sentence for the 2009 beating of Ri-Ri.

On the DL

Ouch. Demi Lovato has something wrong with her foot. The Sonny With a Chance star has been tweeting about being injured, posting a photo of crutches. Lovato’s rep won’t give details but the singer’s recent post was telling: “Never, ever, ever, EVER let your roommate clean your hardwood floors with Pledge.” Guess she won’t be doing endorsements for that brand any time soon.

Barbara Walters isn’t “scratching too much” from chickenpox, but she told her cohosts she won’t be back at The View for three more weeks. The 83-year-old was hospitalized Jan. 19 after fainting and cutting her head; she said she had the chickenpox and a fever at the time, but didn’t realize it. Her best remedy? “Facebook, Twitter and calamine lotion.”

A family way

Leah Messer is a third-time mom at the ripe old age of 20. The Teen Mom 2 star welcomed a girl with pipeline engineer hubby Jeremy Calvert on Monday, Us Weekly confirms. The stay-at-home mom (who first appeared on season 2 of MTV’s 16 and Pregnant in 2010) shares twin daughters Aleeah and Ali, 3, with ex-husband Corey Simms, whom she divorced in April 2011 after cheating revelations surfaced (she admitted to sleeping with her ex bf Robbie Kidd the night before the wedding).

Better together

Leighton Meester knows who she is going to spend Valentine’s Day with: her The Oranges costar Adam Brody. Apparently the two have been an item since filming the indie in 2011. Brody was most recently linked to director Lorene Scafaria, who wrote Nick and Nora’s Infinite Playlist. The Gossip Girl star previously dated actor Aaron Himelstein.

Courteney Cox is breaking out of Cougartown to play Matthew Perry’s potential love interest in his series Go On.

No more alimony

Don’t expect Charlie Sheen to swap vows any time soon. He told Katie Couric he is done. The Anger Management star learned his lesson with actresses Donna Peele and Denise Richards and frequently rehabbing Palm Beach socialite Brooke Mueller. Sheen is reportedly dating adult film actress Georgia Jones, 24. Good luck with that.

Vegas baby!

Britney Spears is set to sign a deal for a Las Vegas residency. Her longtime manager Larry Rudolph told Extra that a Sin City show is close to being announced. The 31-year-old has been in talks with two casinos.