Sure there's a cold front sweeping through the country this holiday season, but leave it to these sexy Hollywood celebs to heat up the day in their sexy white-hot bikini style.

PHOTOS: Stars Strip Down Into Their Winter White

• TAGS

• Sexiest Bodies Hollywood
• Alessandra Ambrosio
• Anna Farris
• bikini
• Britney Spears
• Camila Alves
• Cindy Crawford
• Elle Macpherson
• Eva Longoria
• Geri Halliwell
• Hayden Panettiere
• Holly Madison
• Kelly Bensimon
• Kelly Carlson
• Kim Kardashian
• Naomi Campbell
• Nicollette Sheridan
• Pamela Anderson
• Paris Hilton

From fab looks to trying-too-hard trendy, our Style Radar picked up on the stars that stepped out in style last night and those that missed the mark!

As if we weren't still salivating over Katherine Heigl's stunning Lanvin dress from last Friday's Ugly Truth premiere, the 27 Dresses star outdid herself -- and our expectations -- in a bold sapphire draped Reem Acra dress with jewel waist embellishment at The David Letterman Show in New York -- we're hoping to see 25 more fab looks from the smokin' (literally) actress.

In today's gallery - check out Katherine Heigl, Leslie Mann, Anna Faris, Toni Collette, Elizabeth Banks, Naomi Watts, Emma Roberts & more!

Click here for our Style Radar Gallery!

• TAGS

• Style
• Anna Farris
• Elizabeth Banks
• Emma Roberts
• Katherine Heigl
• Leslie Mann
• Naomi Watts
• Toni Collette
• Ugly Truth