This week brings another birthday bash, but this one is for Playmate Carmella DeCesare. And it's in Vegas, baby! After waking up at 4:30 a.m. for the trip, the girls (sans Hef) help Sin City live up to its name. They stay at the exclusive Hugh Hefner Suite at the Palms Hotel, flash a window washer, enjoy some cake and cocktails, hang at the pool and engage in a bit of wet 'n' wild group frolicking in the suite's custom shower. But before they know it, the girls' 9 p.m. curfew rolls around, and it's time to get back to the Mansion--even though Kendra's having a wee bit too much fun. The girls eventually get home (a little late) and unwind--each in their own way--which is something they all need after a lengthy, action-packed day.

There's plenty of hot stuff going on this week. First, the girls slip between the sheets for another sizzling photo shoot--and visions of a Playboy cover dancing in their heads. Then Holly not only decides to renovate the Playboy guesthouse (last designed by Hef's former gal-pal Barbi Benton in the '70s) but hones her cooking skills with a barbecue. The pressure of doing both gets her a little hot under the collar--and pretty stressed out. The time-consuming renovation process is a pain, but the barbecue goes off without too many hitches. Things take a turn for the better when (after some snooping around, naturally) the girls finally get to see themselves on the cover of the November issue of Playboy. Hot stuff indeed.

Before the special Playmate of the Year luncheon, Holly decides to have a slumber party.