Re-watch: Sam Smith webchat
Sam Smith will be joining Marvin live in the studio on Sunday's Vodafone Big Top 40.
The BRITs Critics' Choice winner releases his new single 'Money On My Mind' on Sunday and Marvin will be letting him know first how it gets on in our chart.
While he's here Kat will be sitting him down in front of our studio cameras where he'll be answering your questions in a live webchat.
It all kicks off from 4pm this Sunday but you can get your questions in early, either add them in the comments below or tweet @bigtop40 using the hashtag #SamSmithBT40.