Playboy's new Playmate of the Year has taken aim at Hugh Hefner's former fiancee, insisting the magazine boss "could do better."

Crystal Harris called off her engagement to Hefner earlier this week - just days before the couple was set to wed at the Playboy Mansion.

And newly-crowned Playboy Playmate of the Year, Claire Sinclair, admits she wasn't surprised when she heard the news.

She tells Eonline.com, "She seemed very unhappy. It was blatantly obvious to everyone that they didn't have much in common... but Hef cared for her and she made him happy, so, of course, everyone was going to support him."

Sinclair, who is dating Hef's son Marston, hopes the Playboy boss doesn't try to reconcile with Harris, adding, "He deserves better."

And the Playmate of the Year is convinced Harris rushed into the idea of marriage: "She should have been a little more adult about it and decided months ago. To put people through this five days before a wedding, I think it's horrific."