People reports that Lavigne and Jenner finished off their night with a stop at Voyeur in West Hollywood, strolling into the club hand-in-hand sporting matching black hoodies.
The happy couple joined friends and were seen snuggling and sharing a few kisses. According to an onlooker, the two "acted like they were the only two in the club" and stayed out until closing time.
During MTV's "The Hills" Season 6 live after show Kristen Cavallari also confirmed that Jenner is dating the female rocker.
(In the Season 6 premiere, which Jenner is still part of the cast, Heidi Montag reveals her plastic surgery makeover to her family, which was very dramatic of course.)
The couple reportedly got steamy in Sin City as well.
Earlier reports this month said the rocker and reality TV star went as far as getting matching tatoos while partying in Las Vegas.
Lavigne decided to get a tattoo on her wrist - of the number 30, accompanied by a lighting bolt. Jenner later got a matching tattoo of a lightning bolt below his ear, People reports.
Whether or not the two will keep up the spark, at least they will have lighting bolts as a memory of their time together.
Lavigne filed for divorce from Sum 41 frontman Deryck Whibley last October after more than three years of marriage and Jenner split from Playmate Jayde Nicole in December, E! Online reports.