By Breaking Celebrity News Staff

Reigning Dancing with the Stars champion Karina Smirnoff and baseball journeyman Brad Penny have called off their engagement.

"They are just two different people," a source told E! -- who first broke the story -- about why the couple, who became engaged 14 months ago, did not make it to the altar.

While the Russian beauty was seen wearing the engagement diamond ring that Penny gave her during an appearance in Las Vegas over the weekend, she only wore the ring for the cameras, the source also said.