Groban, 34, will be the porky diva's first new man since splitting from longtime boyfriend Kermit the Frog, reported Entertainment Weekly.
The singer has appeared on-screen with Miss Piggy before - the odd couple shared a few magic moments in the film "Muppets Most Wanted", and Groban teamed up with her again for the music video to accompany his Pure Imagination track earlier this year.
The new "Muppets" series, which launches in the US on September 22, also features cameos from Liam Hemsworth, Reese Witherspoon and Imagine Dragons.