The song Telephone is by Lady Gaga, and features Beyonce.
Lady Gaga
Lady GaGa and Beyonce.
Beyonce.
Lady Gaga.
Beyonce Knowles :)
Beyonce
Beyonce :)
Lady Gaga and Beyonce.
if you mean which other artist featured in lady gaga's 'telephone', then the answer is beyonce Knowles
Beyonce
Telephone ft. Lady GaGa