Lady gaga
Lady Gaga
Lady GaGa and Beyonce.
Beyonce.
Lady Gaga.
Beyonce
Beyonce Knowles :)
if you mean which other artist featured in lady gaga's 'telephone', then the answer is beyonce Knowles
Lady Gaga and Beyonce.
Beyonce :)
Lady Gaga sings Telephone with Beyoncé, but it's mostly Gaga singing.
Telephone ft. Lady GaGa