ZZ Top’s Billy Gibbons — David Letterman’s Got Beard And Knows How To Use It (VIDEO)

[[tmz:video id=”0_dsiduwud”]] David Letterman just got the highest beard praise possible … because it came from ZZ Top guitarist Billy Gibbons. We caught Gibbons at LAX and asked him to rate Letterman’s scruff on a scale from 1 to 10. The bearded…

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