Brad Pitt and Angelina Jolie were the center of attention at The Tree of Life premiere tonight during the Cannes Film Festival, and there were plenty of other stars on hand to join them on the red carpet. Jude Law, who is one of the jurors at this year's film festival, joined Brad's costar Jessica Chastain, in addition to Rob Lowe, Zoe Saldana, Gwen Stefani, and Gavin Rossdale. Gwen and Gavin joined in on the fun in France following a week in his native Britain, and they wasted no time throwing on bikinis and going shirtless to enjoy the Mediterranean over the weekend. Sean Penn shares the screen with Brad and Jessica, and he joined them for today's event as well. Sean's girlfriend, Scarlett Johansson, didn't walk the press line, however. Brad's big evening caps off an exciting week for the Jolie-Pitts. Angelina made the rounds last week to chat up and debut her Kung Fu Panda 2, also making the exciting announcement that her directorial debut will be called In the Land of Blood and Honey and will hit theaters on Dec. 23.