Does what happens in Cannes stay in Cannes? Antonio Banderas was photographed hitting the town with a mystery woman during the French film festival, leading many to speculate that he and wife Melanie Griffith had pulled the plug on their 17-year marriage. But now, Griffith's sister is speaking out exclusively to Breaking Celebrity News, insisting that their marriage is fine.

Griffith, 56, and Banderas, 53, have been married since 1995. But lately, they have been plagued by rumors that their love has run its course.

The last time the couple were spotted in public together was on March 16. More recently, photos of Banderas dancing with sexy actress Natalie Burn at the Gotha Night Club in Cannes, France raised a red flag about their relationship status.

However, Griffith’s half-sister, Tracy Griffith, spoke to Breaking Celebrity News on Tuesday and when asked if her sister and Banderas were splitting up emphatically said, “No.”

Tracy, who shares father Peter Griffith with Melanie, told Breaking Celebrity News that she speaks with her sister “all the time,” and that the couple were definitely still together.