Renee Zellweger went on Letterman Thursday night to promote "Leatherheads" when the subject of Tracey Ullman's spot-on impression of Zellweger (on her show "State of the Union") came up. Ullman has said of doing her impression of Renee, "I just put these eyelashes on and tried to think of Lamb Chop from Shari Lewis."
Renee pointed at a picture of Tracey in costume and said of it, "My reason for calling a therapist for the next six months......
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