Pop star Lady Gaga is all set to co-host 'American Top 40' chart countdown show alongwith Ryan Seacrest.
The 28-year-old 'Born This Way' star will take calls and questions from fans as part of the promotional campaign for 'Artpop', reported Contactmusic.
Gaga will wrap up her historic seven-night concert stint at New York's Roseland Ballroom on Monday.
The fabled venue will shut its doors for the last time after the singer's final show.
