Justin Timberlake held on tightly to his script yesterday as he arrived for another afternoon on the LA set of The Social Network. He came in a fedora and a plaid shirt, but it didn't take long before he was suited up to get into character as one of Facebook's founders. JT's stay in California has allowed him to have some quality time with Jessica Biel, even though she spent her Friday partying without him.

To see photos of Justin on the set, just read more.