After partying all weekend at the Toronto Film Festival, Drew Barrymore (above) was a no-show at the promotion for her roller derby movie. “They had a press junket for ‘Whip It’ at the Park Hyatt, and Drew completely bailed,” our source reports. Barrymore might have been partying too hard with her pal Amanda Seyfried, who stars in “Jennifer’s Body,” a couple of nights before at a Nikki Beach bash. Another tipster told us, “They reason she canceled is supposedly because she lost her voice.”