Battle of the Bobbleheads: The Hills Edition

Kristin Cavallari and Stephanie Pratt must not be spending any of their extremely hard-earned Hills dough on the fine cuisine that Los Angeles has to offer.

Both ladies attended KISS FM Jingle Ball in L.A. on Saturday night, dressed head to toe in black, and showing off physiques so rail-thin we had to ask, WTF is going on? Pratt has offered the "I'm just so stressed out" line as the reason for her weight loss, while we imagine Cavallari is just disintegrating.

Battle of the Bobbleheads: The Hills Edition
	Stephanie Pratt. Her new body and face...definitely an upgrade.
	Kristin Cav. Girl is on fire!
	Neither. Sick, sick, sick.
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Credit: Celebuzz

Kristin Jokes About Becoming a Lesbian

"On the car ride over here I was talking to my girlfriend and said, 'Let's just become lesbians!'" the "Hills" star quipped to "Extra" at the Jingle Ball in Los Angeles Saturday. "Screw all these guys!"

"Obviously I'm joking..." Cavallari went on.

When asked if she'll have a new man by New Year's, the actress -- who doesn't have plans for the holiday yet -- says, "I don't know. We'll see!"

Cavallari has said she doesn't want a boyfriend, and even recently rejected John Mayer's advances.

"I didn't want to be another notch on his belt," she told Ryan Seacrest on KIIS-FM in September.

Credit: Extra

Stephanie Pratt: Grove Gal

Making time for some holiday shopping, Stephanie Pratt was spotted fulfilling her gift list at The Grove shopping center yesterday (December 6).

The “Hills” hottie was all smiles as she strolled past a few shutterbugs en route to her destination, sporting a black coat with grey leggings and black boots.

The night before, Stephanie was all about getting into the holiday spirit as she arrived t the 2009 Jingle Ball at the Nokia Theatre in Los Angeles.

Miss Pratt joined a host of fellow celebrities at the shindig where big names like Taylor Swift, Keri Hilson, Fabolous, Ting Tings, 3OH3!, LMFAO, Jay Sean, and Jason Derulo performed.

Credit: Celebrity Gossip

Kristin Cavallari: Jingle Bell Ball Beauty

Getting all prettied up for a night on the town, Kristin Cavallari stepped out for the 2009 Jingle Ball at the Nokia Theatre in Los Angeles on Saturday night (December 5).

The “Hills” hottie smiled as she posed for pictures on the red carpet, proceeding to head inside to check out the fun-filled charitable festivities.

In related news, Miss Cavallari has been her usual busy self on her Twitter account, most recently posting messages relating to her sexy appearance.

She writes, “My friend says to me that I look like Alicja Bachleda - Curus. Colin Farrell’s girlfriend. I dont know whether that is a compliment or not.”

The 22-year-old added, “I want to grow old without face lifts. I want to have the courage to be loyal to the face I have made.”

Credit: Celebrity Gossip