Biel and Timberlake threw a pre-wedding party at Cala Masciola beach on the Adriatic Sea on Wednesday, with the nuptials apparently scheduled for this weekend.
© PA Images / Joel Ryan/AP
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Butler was asked about Biel and Timberlake's possible wedding in an interview with E! News.
"I'm very excited for her," Butler commented.
The Chasing Mavericks star said of Timberlake: "I know Justin. He's a good dude. He's a great guy.
"Great guy and she's an exceptional woman. I'm very happy for her."
Butler went on to describe Biel as "a joy to work with" on the set of Playing for Keeps, an upcoming soccer-themed comedy.
Playing for Keeps opens in US cinemas on December 7 and in the UK on January 1, 2013.
Watch a trailer for the film below:
