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    Katy Perry Is This Week's Most Valuable Partyer!

    Katy Perry Optic Photos/

    Katy Perry is awesome.

    The pop powerhouse is currently hard at work on her California Dreams tour, and last night across the pond in London, Katy was out late for a good cause.

    First, she performed at the Hammersmith Apollo to rave reviews while donating some of her proceeds to Red Cross relief in Japan.

    Most singers might call it a night after that, but not Katy. She then headed to the Radio 1 studios at 1 a.m. to be on the air for yet another charitable cause...

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    The "Firework" babe was a guest on Chris Moyle's record-breaking 51 hour BBC show, which raised $2.4 million for Comic Relief. Being the good sport she is, she even donned their signature red nose for photogs when she exited the studios.

    It was definitely a late night for Katy, but good deeds are worth staying out past your bedtime and miss some beauty rest.

    Speaking of sleep-deprived, this week's Party Foul goes to Katie Holmes and no, it's not for letting Suri pick up penis gummies.

    Katie's getting called out for bringing 4-year-old Suri to Serendipity so late. The mommy-daughter duo was out after midnight enjoying desserts in NYC on Tuesday night.

    We're all for ice cream dates, but can't Katie take her young kiddo out at a more reasonable hour? Or find an adult friend to join her on her night-owl outings instead of her poor kid?

    Let's leave the late nights on the town for Suri until she hits the teenage years at least, OK?

    WATCH: Katie as Jackie O in The Kennedys