Hugh Hefner doesn't waste any time.
"With Crystal gone, Anna is my best girl, but she's also Crystal's good friend," Hefner tweeted Thursday. "Anna really is one in a million."
Berglund, who was named the magazine's Playmate of the Month in January, has appeared on The Girls Next Door and Holly's World. A 2008 UCLA graduate, Berglund -- who majored in theater -- has also filmed guest spots on Hannah Montana and Desperate Housewives.
According to Harris, 25, things aren't romantic between Hefner and Berglund -- yet. "She's just over there regulating making sure Hef ends up with a good girl," she tweeted.