United Kingdom, March 23 -- Kathryn Hahn was star-struck by Sir Mick Jagger's knees.

The 'Studio' actress' dad rented out a basement for a Rolling Stones music video shoot when she was a teenager, and though she barely caught a glimpse of any of the group, she was still very excited.

Asked when she was most star-struck, she told Empire magazine: "When I was in high school, my dad had an office building and he'd rent out the basement.

"The Rolling Stones came to shoot a video there for their 'Steel Wheels' album, I think.

"We were lurking in the basement and we could see Mick Jagger, but only from the knees down.

"It was never quite confirmed that it was Mick Jagger, but I choose to believe it was."

If she wasn't an actress, the 51-y...