Go ahead and take sides in the heartbreak of celebrities. Kitson will help you. The Los Angeles boutique’s “Team Aniston” T-shirt is a hot seller after being mentioned in the Vanity Fair article in which Jennifer Aniston vented about wayward husband Brad Pitt. There is also the “Team Sienna” T-shirt, supporting Sienna Miller, cheated on by fiancé Jude Law. Less popular are the “Team Jolie” shirts, backing Angelina in the Aniston-Pitt case. The boutique has become so hot in L.A. that there are 20-minute lines out the door. It doesn’t hurt that it counts a string of A-list celebrities as customers, including Halle Berry, Britney Spears, Eva Longoria, Debra Messing, Lindsay Lohan, Jessica Simpson, Teri Hatcher and Paris Hilton. These people can all afford the $800 cargo pants and the pricey handbags. The store also carries Gwen Stefani’s L.A.M.B. clothing and shoes and Nicky Hilton’s Chick line.