2010-02-08 00:17:18 -

Actress AMANDA SEYFRIED hated every minute of her recent Vanity Fair phot= oshoot with celebrated fashion photographer ANNIE LEIBOVITZ, because she = had spent the night before throwing up.
The Mamma Mia! star joined fellow up-and-coming screen stars like Krist= en

Stewart, Carey Mulligan, Emma Roberts, Blake Lively, Zoe Kravitz and L= eighton Meester for a Young Hollywood-themed cover shoot.
Sick Seyfried was a mess on the set of the shoot and regrets not making= the most of her time working with Leibovitz.
She says, "It was one of the worst days of my life. I had been ill, I h= ad been throwing up since 4am that day and I had to come in. It was my bi= g moment to work with Annie Leibovitz and I totally crashed out." But the 24 year old has some good memories of the cover shoot - because= the other actresses were all so attentive to her.
She adds, "It was awful, but these girls were so supportive. You wanna = hate them because they're your competition but every single one of them w= ere (sic) so cool."