By SARAH BULL Spot the baby bump: Kelly Brook looks as trim as ever in a shot for a new Reebok campaign, taken just days before she announced her pregnancy. She wears a blue crop top and white jogging bottoms, as well as Reebok's TrainTone trainersShe announced earlier this week that she is expecting a baby with her former rugby player boyfriend Thom Evans.But svelte Kelly Brook looks as trim as