The "Gone Girl" star pulled up to the school event wearing a dark-colored suit, while his first ex-wife kept it casual in a pair of jeans and a black jacket.
The "On The Floor" singer filed for divorce from the "Air" filmmaker, 52, in August after just two years of marriage, though the exes have been frequently seen together since.
The Oscar winner picked up the meaningful item before heading to meet the "Hustlers" actress for lunch at Soho House in West Hollywood, Calif., on Sunday.
If you’ve “got a pocket full of cash [you] can blow,” maybe you can get Bruno Mars to perform at your wedding. Renowned celebrity event planner, Marcy Blum, revealed Jennifer Lopez wanted Bruno to perform at her since-canceled wedding to Alex...