Credit: Photo: Bristol Is Pretty in Purple on September 5, 2010

Bristol Palin decided Saturday was "Take Your Son to Work Day," as she brought 21-month-old Tripp to rehearsals.

Tripp is living in Los Angeles with Bristol, who moved there to shoot Dancing with the Stars. Where's Grandma Sarah? She'll be in the audience tonight, presumably holding baby Tripp. Can't wait to see the happy family all together again...




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