Fresh off of her Emmy win 'Mike & Molly' star Melissa McCarthy's all set to host this week's 'Saturday Night Live.'

And she's really, really excited about it.

After the jump check out the hilarious promo featuring McCarthy, her 'Bridesmaids' co-star Kristen Wiig, and this week's musical performers, Lady Antebellum.

It was a big night for Lady Antebellum, Miranda Lambert and Carrie Underwood at the 45th annual Academy of Country Music Awards (Sun., 8PM ET on CBS). Nominated for seven awards, Lady Antebellum took home three: Top Vocal Group, Single Record of the Year and Song of the Year for "Need You Now".

Watch the video after the jump.