Insider Challenge: Who's That Star?

Think you're good at celeb spotting? Test your Hollywood know-how with today's Insider challenge!

Who's that missing member of Sgt. Pepper's Lonely Hearts Club Band?

For a closer look, check out the photographic evidence and leave your best guess in the comments section below. Tune in to "The Insider" on TV tonight and your name may be the one called out on the air -- but only if you guess the mystery star!

Here's a hint: This artist ended a recent performance by jumping on a giant cake.

Published 10/29/08 by

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Katy perry.

chocalate 10/30/08 Reply
ellen pompeo

sully61 10/30/08 Reply
ellen pompeo

sully61 10/30/08 Reply
Katy Perry

KristyS4 10/30/08 Reply
It's Katy Perry

Anonymous 10/30/08 Reply
kathy perry i kissed a girl song is the best

Anonymous 10/30/08 Reply
It is Katy Perry.

Anonymous 10/30/08 Reply
it is Katy Perry.

Anonymous 10/30/08 Reply
mos def courtney cox!

MuhammedO 10/30/08 Reply
Katy Perry

BlairS 10/30/08 Reply
katy perry.

Anonymous 10/30/08 Reply
katy perry

Meka1119 10/30/08 Reply
Katy Perry

Anonymous 10/30/08 Reply
this is Elizabeth Berkley! Who would have known all those years of saved by the bell would have paid off!!!

Anonymous 10/30/08 Reply
its Tia Leoni

Anonymous 10/30/08 Reply