Martha Stewart turned down Dancing With the Stars season 18 and Mary-Kate Olsen turned down now-fiance Olivier Sarkozy's first proposals in Us Weekly's top stories. Credit: Rommel Demano/Getty Images; Noam Galai/WireImage

Not interested in the rumba! Stars like Martha Stewart and Austin Mahone turned down the opportunity to perform on season 18 of Dancing With the Stars. Plus, Mary-Kate Olsen said no to now-fiance Olivier Sarkozy's first proposal. See the top stories: 

Thanks but no thanks, DWTS. Not every celeb dreams of having a shot at Mirrorball glory. Prior to the Dancing With the Stars season 18 cast announcement on Tuesday, March 4, several other big names were being considered for the show -- but they turned it down, a source reveals in the new issue of Us Weekly.

She took her time! Mary-Kate Olsen made sure fiance Olivier Sarkozy was the one before saying "yes" to an engagement. An insider reveals exclusively in the new issue of Us Weekly that Sarkozy first proposed months ago, but the fashion designer turned him down at the time.

Too far? Joan Rivers and E!'s Fashion Police not only criticized Chris Hemsworth's pregnant wife Elsa Pataky's Oscars dress from Sunday, March 2, but they also slammed the size of her baby bump.

Mark your calendars: Kim Kardashian and Kanye West have set a date for their wedding! As revealed in the new issue of Us Weekly, the high-profile couple will be married in Paris, France, on Saturday, May 24.

After pleading guilty to money fraud in their March 4 case, Teresa and Joe Giudice have another plea for the judge, this time for the sake of their children. The Real Housewives of New Jersey stars plan to ask that they serve their respective potential jail times separately so that someone will always be available to take care of their four daughters -- Gia, 13, Gabriella, 9, Milania, 8, and Audriana, 4.