Justin Bieber taped a segment with David Letterman yesterday where the two teamed up to trash Mariah Yeater with Justin telling Dave, “I could smell a weasel, too.”

Bieber proceeded to tell Letterman all about the process of supplying DNA for the paternity test — saying, “Yeah, I took it … They just swab your mouth.”

Mariah Yeater has yet to supply her baby’s DNA for comparison to Bieber’s.

Here is a preview of the interview (Courtesy of TMZ) which airs tonight.

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