This year's Grammy Awards will kick off with a bang as two musical icons team up for very first time.
RadarOnline.com has exclusively learned that the rumors are true: Elton John and Lady Gaga will sing together on stage for the opening musical number at Sunday's Grammys in Los Angeles.
A source tells RadarOnline.com that Elton and the Paparazzi singer rehearsed Saturday afternoon at Center Staging studio near the Burbank airport, adding that the two sounded "incredible".
Both singers are known for their outlandish styles, but Elton was dressed in all black and wearing sunglasses while the usually masked Lady Gaga was dressed casually and in a simple coat.
Elton's people confirmed that the dynamic duo will be the opening act.
This is not the first time John has teamed up with a singing sensation of a younger generation.
In 2001 , he famously performed with rapper Eminem for a Grammys moment to remember, singing “Stan”.
Lady Gaga is nominated for five Grammys, including Album of the Year (The Fame Monster), Song of the Year (Poker Face), and Record of the Year (Poker Face).
The 52nd annual Grammy Awards will be broadcast Sunday on CBS at 8 p.m.