Who is the blonde girl akon sang with?

Akon sang with the blonde girl, who is actually a well-known singer and actress, on the track "Lonely." The song features a sample from Bobby Vinton's "Mr. Lonely." The female vocalist in the music video is not prominently featured, but Akon's collaboration with various artists has included several notable female singers over the years. If you are referring to a specific performance or event, please provide more details for clarification.