It may not be a match made in heaven, after all. Sports Illustrated cover girl Kate Upton's relationship with her ex-Dancing With The Stars boyfriend Maksim Chmerkovskiy has hit a major rough patch less than two months after the pair went public, RadarOnline.com has exclusively learned.

"Maks has been telling friends that he is no longer bringing Kate to a wedding that they were both scheduled to attend together," a source close to the couple dished. "Maks isn't saying anything bad about her, but it's a very telling development that she's no longer accompanying him to the wedding."