Jennifer Garner dressed up to stop by the Late Show With David Letterman in NYC today. She arrived in the Big Apple last night following a sweet day out with Violet in LA. Violet and Seraphina are in good hands while Jennifer is away, since they're being cared for by Ben Affleck's mom, Chris. They hit the park with their grandma and a nanny in Santa Monica, where they checked out the swings and played in the sand — little Seraphina is getting so big! Jennifer will be back in the spotlight tonight with an appearance on the red carpet for the premiere of Arthur, which her costar, Russell Brand, has already started promoting.