When Queen of Cool Clothes designer Stella McCartney (above right) was spotted her "jeggings" on a stroll in London recently, there was an online discussion over the jeans-meets-leggings style at New York Magazine's The Cut.

But we knew for certain that jeggings were set to replace skinnies for Spring 2010 once we saw the designer's BFF Gwyneth Paltrow wear a similar pair to attend McCartney's Paris fashion show this past weekend.

But before you squeeze yourself into the trend, see other celebs in jeggings and how they get the look right -- and wrong -- in my new Jeggings lookbook and vote on your favorite pics.

Photos: Tony Barson/Wireimage; Jack/FilmMagic