Madonna/Instagram

It seems Madonna still has a soft spot for her ex, Sean Penn.

In honor of her first ex-husband's 54th birthday, the Material Girl posted a cheeky photo of her son Rocco channeling one of Penn's most memorable characters: Jeff Spicoli from the 1982 hit "Fast Times at Ridgemont High."

"Jeff Spicoli is alive and well in the South of France! #boom #fuzzy," the 56-year-old captioned the photo posted Monday.

In the pic, her 14-year-old son from her later marriage to British film director Guy Ritchie wears a Hawaiian-print shirt tied into a crop top and rocks blond waves and a dazed expression.

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Madonna and Penn, who were married from 1985 to 1989, have been on great terms in recent years. In March, Penn attended the singer's Oscar party in Los Angeles, where he was seen with girlfriend Charlize Theron. Madonna and Rocco were also on hand in November to support Penn's charity in Haiti.

The singer and her children, including recent high school graduate Lourdes and adopted siblings David and Mercy, have been vacationing in France, where Madonna celebrated her 56th birthday - a day before Penn's - with a 1920s-style bash at a villa in Cannes.