Marion Cotillard With Baby Marcel Pictures at LAX

Marion Cotillard held on tight to smiley son, Marcel, as they went through security at LAX this afternoon. The 3-month-old has been on the go since his birth in May and was also spotted at the airport with his mom and dad, Guillaume, just last month. Marion is traveling with Marcel to NYC, where she'll hit the red carpet for the premiere of Contagion tomorrow night. The movie was screened at the Venice Film Festival over the weekend, and while Marion didn't make the trip overseas, her costars Matt Damon and Gwyneth Paltrow were on hand to represent the project. Matt will once again show off the film at Wednesday's event, but Gwyneth will miss the fun since she's still enjoying her Italian getaway with pals Beyoncé Knowles and Jay-Z.