Jason Aldean, Toby Keith, Brad Paisley and Keith Urban will also take to the stage during next month's ceremony in Las Vegas, it has been announced.
All six artists have been nominated in the 'Entertainer Of The Year' category, which is chosen by fans. Votes can be registered online from March 11 and the polls will close during the third hour of the broadcast.
Lambert has scooped the most nominations at the annual event, being recognised in seven categories including 'Single Record Of The Year' and 'Song Of The Year' for her track 'The House That Built Me'.
It has already been announced that The Band Perry have won the 'Top New Vocal Duo Or Group' prize and that Eric Church has been named 'Top New Solo Vocalist'. They will now compete for the 'Top New Artist' award, to be handed out during the show.
The 46th annual Academy Of County Music Awards air Sunday, April 3 from 8pm ET/PT on CBS.
> In Full: ACM Awards 2011- Nominees