Miranda Lambert joins host Nan Kelley on GAC's "Top 20 Country Countdown" tonight at the close of a very rewarding week.

Miranda, who won the Academy of Country Music's Top New Female Vocalist honor in 2007, picked up three ACM nominations on Tuesday, including Top Female; Album of the Year, for Crazy Ex-Girlfriend; and Single of the Year, for "Famous In A Small Town." Miranda's competition for Top Female includes Martina McBride, LeAnn Rimes, Taylor Swift and Carrie Underwood. We'll find out who wins when the awards are handed out in Las Vegas May 18.

Top 20 Country Countdown counts down the week's top country videos from No. 20 to No. 1 as voted by viewers on each week on GACTV.com. A new countdown premieres every Friday at 8 p.m. ET on GAC and airs again Saturdays at 10 a.m. and 5:30 p.m. ET; Sundays at 1 p.m. ET; and Mondays at 10 a.m. ET. Viewers can vote for their favorite videos, as well as purchase Top 20 artists' albums and ringtones at GACTV.com.

THIS WEEK'S CHART:

1. Alan Jackson "Small Town Southern Man"
2. Carrie Underwood "All-American Girl"
3. Taylor Swift "I'm Only Me When I'm With You"
4. Chuck Wicks "Stealing Cinderella"
5. Keith Urban "Everybody"
6. Carrie Underwood "So Small"
7. Brad Paisley "Letter To Me"
8. Sugarland "Stay"
9. Kenny Chesney "Shiftwork"
10. Gary Allan "Watching Airplanes"
11. Lady Antebellum "Love Don't Live Here Anymore"
12. Bucky Covington "It's Good To Be Us"
13. Tim McGraw "Suspicions"
14. James Otto "Just Got Started Lovin' You"
15. Jason Aldean "We Laughed Until We Cried"
16. Craig Morgan "International Harvester"
17. Luke Bryan "We Rode In Trucks"
18. Bon Jovi & LeAnn Rimes "Til We Ain't Strangers Anymore"
19. Brooks & Dunn "God Must Be Busy"
20. Alison Krauss & Robert Plant "Gone, Gone, Gone (Done Moved On)"