Did Selena Gomez move on from Justin Bieber with Niall Horan? Gomez and the One Direction member were spotted hanging out in London over the weekend. It's not clear why the two linked up but now there are rumors that Gomez and Horan are dating.

A source told Hollywood Life that Gomez made out with the "Best Song Ever" singer but only did it to make her ex Justin Bieber jealous.

"She knows it's going to piss Justin off because he always says that 1D is trying to steal his crown," the source told the site.

Reportedly the "Come & Get It" singer has plans to see Horan again but she's not looking for a serious relationship.

"Selena is happy but it's not looking like a huge relationship is going to come out of this recent hook-up. Friends with benefits is what she likes at this time," the source told Hollywood Life. "She'll hang out with him again because he will be able to take her to some special places."

A different source told the site that Gomez's best friend was the one who set the two musicians up.

In other news, Gomez seems to be doing fine after completing a secret stint in rehab at the beginning of the year. According to Radar Online, the 21-year-old voluntarily checked herself into Dawn at the Meadows in Arizona on Jan. 5 for a two-week program.

Her rep claims Gomez's rehab stint had nothing to do with substance abuse. Reportedly her parents were worried that she was partying too much and it was getting her into trouble. They asked her to go to rehab so she could "clean up."

"Selena voluntarily spent time at Meadows but not for substance abuse," her rep said in statement, Radar reports.