After spending time with her ex, Avril Lavigne had herself a girls' night watching the biggest pop star on the planet perform.

Avril Lavigne Gives Words Of Wisdom About 'True Friends'

On Sunday, Lavigne posted a new photo on Instagram as she sits down with a group of close friends and looks super happy to be around loved ones. They all happened to be in Las Vegas watching Britney Spears at her show in Planet Hollywood. And based on what Lavigne wrote in the caption, she had a blast.

 Besties birthday weekend. #GirlsTrip @britneyspears @PHVegas #pieceofme #theaxis

A photo posted by Avril Lavigne (@avrillavigne) on Feb 21, 2016 at 12:32pm PST

In another picture, Lavigne smiles for a picture with Spears and tells her how grateful she is to watch her perform, saying it was a "spectacular time."

Avril Lavigne Is Reportedly Living With Another Man

The "Hello Kitty" singer recently attended a Grammy party last week where she spent the night with Chad Kroeger, her soon-to-be ex-husband. Even though the two are ending their marriage after two years, they've managed to stay good friends. In fact, Lavigne posted a couple photos of herself with Kroeger on Instagram where the mutual respect is clearly visible.

 Clive Davis Grammy Party

A photo posted by Avril Lavigne (@avrillavigne) on Feb 14, 2016 at 10:49pm PST

Clive Davis Grammy Party A photo posted by Avril Lavigne (@avrillavigne) on Feb 14, 2016 at 10:49pm PST