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15 March 2012, 12:32 | Updated: 15 March 2012, 17:35
The 'Domino' singer and the 'Read All About It' star shared the stage on the final night of her latest tour.
Jessie J was joined by Professor Green for an energetic rendition of her hit single 'Price Tag' on the last night of her Australian tour in Adelaide yesterday (14th March).
The 'Who You Are' singer was performing the track, which she dedicated to a member of the audience, when the 'Never Be A Right Time' star jumped on stage to perform the rap section of the track usually filled by B.O.B.
The rapper put his own spin on the lyrics as he played out the rest of the song with the star and got the crowd screaming.
Towards the end of the song the 'At Your Inconvenience' rapper even mimed singing a big note with 'Domino' star Jessie helped him out.
He tweeted after the performance: "The high note i hit at the end of price tag is phenomenal. i should be a f*****g singer."
The pair had been touring Australia together for the past week and Capital FM exclusively revealed this morning (15th March) that the duo will reunite at the Teenage Cancer Trust show on 1st April.
You can view a video of Jessie performing 'Price Tag' with Professor Green below:
*warning this video contains strong language*