Jessica Biel is one of Justin Timberlake's "number one fans"

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 it - I adore him, and I love him as an artist and a performer."

The 43-year-old actress recently hailed Justin as her "best friend" and admitted she is grateful for the understanding they share over their respective careers.

She told InStyle magazine: "I think having a partner who understands this industry and adjacent industries, like the music industry, has been really deeply important and profound for my life and for our partnership because he just understands when I'm working crazy long hours.

"We are able to support each other throughout strange schedules and time apart because we know that's just what it takes to make this kind of art."

The SexyBack singer was diagnosed with Lyme disease last year and it was previously revealed how his wife had pushed Justin to look for answers as he initially thought the exhaustion and pain he had been experiencing were part of getting older and the demands of his two-year Forget Tomorrow world tour.

A source told People magazine: "He's not 20 anymore. But when his symptoms worsened, he realised something deeper was going on.

"He pushed through for months before finally getting answers. The Lyme disease diagnosis brought clarity to a series of unexplained issues that he's been quietly dealing with."

But Jessica "felt like something was off" with Justin's health and "encouraged him to get checked out".

The source added: "She could tell that he wasn't himself. She's incredibly supportive."