United Kingdom, Jan. 5 -- Jessica Biel is one of Justin Timberlake's "number one fans".

The Better Sister actress was a regular fixture in the audience at her husband's Forget Tomorrow World Tour concerts and she didn't feel the need to hold back her excitement because she is so proud of the Mirrors hitmaker - with whom she has sons Silas, 10, and five-year-old Phineas - and his career.

She told E! News: "I feel like I'm up there with his number one fans.

"He's so amazing live. There's just no one like him - who can perform like him, who sings like him. He just brings so much joy.

"I don't care if I look like a crazy person. I'm gonna dance my butt off for two and a half hours.

"I love his music, and I don't care - I'm just gonna say...