Brody Jenner and Avril Lavigne are making their recently rumored romance VERY official.

So official, in fact, that they put it in ink: We hear that the lovebirds got matching tattoos over the weekend.

“They showed up to the opening of Mario Barth King Ink and requested the same tats,” says an insider at the Mirage Hotel in Las Vegas. The reality TV star and the rock princess both requested lightning bolts, she on her forearm and he behind his ear.

“They were really excited about it. They held hands openly and were kissing in a corner. Brody didn’t leave Avril’s side all night.”

Although they refused to pose together on the red carpet at the posh event, a photographer had indeed snapped the first pic of them smooching outside the Chateau Marmont in L.A. on Friday. Later that night, the duo left for their rather romantic trip to Sin City.

And if the matching tats aren’t proof positive that the former playboy may be turning into a one-gal man, a source says Brody just brought the songstress home to meet mom.

“He introduced Avril to his mother last weekend. He’s really head over heels for her and wanted to let her know how serious he was, so he took her to [his mom] Linda’s home. It went really well.”

What a very odd couple.

source: Rumored couple Brody Jenner and Avril Lavigne make it official – with matching tattoos [ny daily news]