Joe & Nick Jonas Celebrate Their Mom's Birthday!

Joe Jonas heads back to his car after dining at the Chateau Marmont on Saturday night (July 12) in Los Angeles.

The 24-year-old singer was joined by his brother Nick and his girlfriend Olivia Culpo.

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The guys were out for the night to celebrate their mother Denise Jonas‘s birthday.

“Happy birthday to my amazing mother @denisejonas love you mom,” Nick tweeted.

Earlier that week, Nick kept it sharp for the Summer 2014 TCA Press Tour held at The Beverly Hilton Hotel in Beverly Hills.