Celeb Tweetup: Workhouse Dog

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It's 6 o'clock and all's well in Tweetland. Celebs are have taken to their iPhones and Blackberries with extra vigor today. Here's what's going on with Mario Lopez (@MarioLopezExtra), Nick Zano (@NICKZANNO), Adam Levine (@adamlevine) and Joan Rivers (@Joan_Rivers):

Mario Lopez is confused about the species of pet he owns:

Nick Zano has rice in his pants:

Adam Levine is really into video games:

And against all odds, Joan Rivers continues to dispense fashion advice: