Heidi Klum
The 39-year-old Project Runway host is without a care—or top—in the world while sunbathing on vacation.
Mariah Carey
The "Fantasy" singer does not leave much to fantasize about.
Lindsay Lohan
No bra, no worries. LiLo strolls through Venice, Calif., in a backless white halter and joins the elite sideboob club.
Olivia Wilde
The stunning actress turned heads at the Cowboys & Aliens premiere—not only for her blousy polka-dot dress, but its unexpected sheer side panels.
Julianne Hough
Ryan Seacrest's gal has got a pair of beautiful...eyes.
Rosie Hungtington-Whiteley
Va-va-voom! The model-actress offers us a relatively healthy dose of sideboob.
Gwyneth Paltrow
The Avengers actress must have carefully practiced this pose over and over before hitting the Met Gala red carpet.
Selma Blair
Not usually known to vamp it up on the red carpet, Selma Blair certainly took a plunge with this outfit choice.
Jennifer Aniston
Even with a sliver of sideboob, Jen looks polished and ravishing!
Anne Hathaway
The 2013 Oscar-nominated actress somehow evaded a huge nip slip in this satin brown dress at the Abbott Awards.
Britney Spears
Mother of all candid sideboobs: The princess of pop strolled through L.A. without a care and without a bra.
Celebs also have their share of wardrobe malfunctions—take a look at these photos!