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Sarah Silverman, Michael Sheen, MET Gala

FameFlynet

Sarah Silverman is certainly not shy!

The comedienne copped a feel of boyfriend Michael Sheen's butt in full view of the cameras at Monday's Met Gala in New York City.

Silverman, 43, apparently couldn't resist showing a little affection for her British beau as the couple made their red carpet debut.

The bold grab was definitely in contrast to her demure dress.

The A Million Ways to Die in the West star looked chic in a bordeaux-colored Zac Posen duchess ball gown, while the Masters of Sex actor cleaned up in Prada.

Sarah Silverman, Michael Sheen, MET Gala

Larry Busacca/Getty Images

Sheen's ex-girlfriend Rachel McAdams was also at the event. The About Time actress, 35, wore a pale pink silk evening dress by Ralph Lauren; she didn't bring boyfriend Patrick Sambrook.

Silverman dated fellow comedian Jimmy Kimmel for several years, but they broke up in 2009.

Silverman and Sheen started going out in February, and the comic is going to be joining her beau on Masters of Sex for the second season.

It's safe to say their romance is red hot!