Remember, you must be a registered user of TheInsider.com to participate. Take a look through the photographic evidence and leave your best guess in the comments section below. Tune in Wednesday to "The Insider" on TV and your name may be the one called out on the air -- but only if you guess the mystery star!
Watch our video to find out which Insider.com user got the challenge correct from Monday's mystery sighting!
We'll give you a hint: This top TV doc broke out on her own for a little fun in the sun.
Lara Wardrobe Cam & Look For Less
CHALLENGE: Who's Rockin That Hoodie?
Click Here for All Things Britney!
Click to Get in on: The Gossip with Lara and Kris.
From Barack to Brad and Angelina: Meet the 8 of '08





Miley Cyrus
Michael Phelps
Barack Obama
Britney Spears
Angelina Jolie
Tina Fey