Mod Sun Moves On From Avril Lavigne With 'Love Is Blind' Star Brittany Wisniewski

9:13 AM PT -- Sources close to the situation tell TMZ that the woman seen with Mod Sun last night was "Love Is Blind" star Brittany Wisniewski.

The woman in the video with Brittany is her costar Alexandra Byrd.

Seems like Mod Sun is a big fan of 'LIB,' by the way -- he spotted Brittany in the crowd at a concert earlier this month ... and took time out of his show to call her out.

Mod Sun has moved on from Avril Lavigne ... 'cause we caught him canoodling with a hot blonde inside a Los Angeles bar.

The singer had his hands all over his mystery lady inside On The Rox in West Hollywood during the after-party for his Monday night show at The Wiltern.

Check out the video, obtained by TMZ ... Mod is happier than a clam as he dances with the woman to music, clasping their hands together and raising their arms before kissing on the lips.

At another point, Mod and his love interest are involved in a make-out sesh as the classic song from "Grease," "You're The One That I Want," by Olivia Newton-John and John Travolta, plays in the background.

As we first reported ... Mod and Avril called off their engagement in 2023 after nearly 2 years of dating. Our sources said Avril broke up with Mod and hooked up with Tyga.

We're told Avril and Tyga eventually split, but they stayed friends. In June, Avril was pictured locking lips with a guy in Lake Como, Italy, although we don't know their current status.

But, like we said, Mod seems to be enjoying his new blonde babe whose identity is still not known. We'll update you once we find out who she is.