Hugh Hefner and Crystal Hefner celebrate the Fourth of July at the Playboy Mansion in this photo posted to her Instagram.
Nina Agdal, a model for Sports Illustrated, is seen in this monokini by Op in this undated image.
Courtesy of Op
Jamie Chung relaxes by a pool in Beverly Hills, Calif., June 18, 2013.
Rihanna on set of a music video in Northern Ireland.
Katy Perry sings during the children's concert at the Washington Convention Center to celebrate military families, Jan. 19, 2013, in Washington.
Joe Raedle/Getty Images
Lady Gaga and Beyonce in the music video for "Telephone."
Gisele Bundchen on the cover of George magazine in 2000.
Azealia Banks is seen in her "Liquorice (Explicit)" music video.
Heidi Montag on the beach in Pacific Palisades in Los Angeles, July 4, 2007.
Mike Carrillo/Pacific Coast News
Mariah Carey posted this photo to her Facebook, July 2, 2014.
Will Ferrell plays Dale McGrew in this circa 2001 "Saturday Night Live" skit.
Saturday Night Live
Gretchen Christine Rossi hosts a pool party at Bare pool lounge at The Mirage Hotel and Casino, July 2, 2011, in Las Vegas.
Rosie Huntington-Whitely is seen in Miami Beach, Fla., Dec. 30, 2011.
Uri Schanker/Getty Images
Alexis Bellino at the Encore Beach Club at the Encore Hotel in Las Vegas, June 29, 2012.
Michelle Williams and Kristen Dunst on the cover of the 1999 movie, "Dick."