Say it isn’t so! Just as initial whispers of a break-up between Marc Jacobs and former model Lorenzo Martone ceased, the big-time fashion designer sparked the rumor mill once again when he didn’t mention his fiance in his acceptance speech at the CFDA awards.

The couple were seen together last week at the amfAR gala looking like their usual, adorable selves (holding hands and everything!); however, insiders say that Lorenzo was caught smooching another lady’s man at Sean Patterson’s birthday party that night!

Was the cheating kiss the reasoning behind Martone’s absence from the CFDA awards and Marc’s speech? Marc couldn’t be reached to comment and Lorenzo declined to comment when presented with the news.

The couple have been engaged since March 2009, after having dated previously for a year.