The fellow coaches will perform an exclusive live duet during Chris Evan's 2Day on BBC Radio 2.
And we can't WAIT to see what they perform.
Other famous faces appearing on the station on May 10 are Damon Albarn, The Voice mentor Paloma Faith, Keane and Jamie Cullum.
Helen Thomas, 2Day Executive Producer said: "Tom Jones and Jessie J are a fantastic addition to 2DAY. We have some amazing live music and entertainment throughout the day and listeners are in for a real treat."
We got a taster of what it's like to see Jessie J and Tom Jones on stage together when the pair performed Black Eyed Peas 'I Gotta Feeling' back on the launch show of BBC One Show The Voice.
Via Yahoo OMG