– Crystal Harris and Hugh Hefner didn't tie the knot yesterday, and they didn't mope, either. Hef took to Twitter to share his chin-up attitude: "This was going to be my wedding day, but life is full of surprises," the 85-year-old wrote. "After all is said & done, staying single is probably for the best." Single, however, is not code for "alone." Perez Hilton reports that exes Karissa and Kristina Shannon (yep, twins) have already moved back into the mansion, which they left a year and a half ago. And TMZ reports that Hef has been cozying up to Miss January 2011. And how did the runaway bride spend her day? Hanging poolside in Las Vegas in a teeny bikini and high heels with a group of friends, one of which was Heidi Montag. But do we detect a hint of sadness in Hugh's voice? A series of tweets posted in rapid succession this afternoon sound a little down. An example: "The Sunday night Mansion movie is Elle Fanning, Amanda Michalka & Kyle Chandler in JJ Abrams' Super 8. Life goes on."