Father-son duo Rishi and Ranbir Kapoor set the stage on fire here Saturday at the 13th International Indian Film Academy (IIFA) awards by performing together for the first time.

Ranbir made a rock star entry with an electric guitar in his hand and performed on "Saada haq" from his hit film "Rockstar". He later donned a tapori avatar and grooved to "Tai tai phish" from "Chillar Party".

Though Ranbir is known for his impeccable dancing style, it was his father Rishi who stole the limelight on the stage.

Rishi entered the stage saying his famous "Karz" dialogue -- "Kya tumne kabhi kisi se pyaar kiya" -- and soon the audience joined him in completing it saying...."kiyaa...", before he kickstarted his act.

Ranbir was seen matching steps with his father on the song "Paisa yeh paisa" from the Rishi's hit film "Karz".

A remixed version of the song "Bachna ae hasino" from Rishi's film "Hum Kisi Se Kam Nahi" was used in Ranbir's 2008 film "Bachna Ae Haseeno", starring Minissha Lamba, Bipasha Basu and Deepika Padukone.

Both the actors were seen competing with each other on their own versions of songs, as a part of the act and at the end Ranbir accepted his defeat, bowing at his father's feet to take his blessings.