A source tells E! that Avril and Brody are definitely dating.
"She met Brody at Koi a couple months ago and sent him over shots and figured he and his friends would be a fun group to hang out with," says a source close to the pop star. "But their friendship quickly turned romantic when she started having a crush on him."
The two have been cooking dinner and watching movies together, but Avril has recently been "backsliding" into her rocker ex-husband's arms...
"She disappeared with Brody for two nights last weekend and is flip-flopping nights between her ex and Brody," a source tells E!.
In addition, the singer has gotten new tattoos with both boys in the last month, says the source.
"She and Deryck got matching ones," our source says. "But then she went again with Brody and they both got tattoos, but not matching."
Although our source says Lavigne thinks she's "just having fun," friends think she better make up her mind before someone gets hurt.
Our two cents: Guys do this all the time and it's nice to see a girl pull the same scenario for once. Play on, player!
Somebody tell Avril that breaking up involves, you know, breaking up. Check out some sadder but wiser stars in our Big Celebrity Splits gallery.