Yes, but it had the lead singer from RBF. So I figured it could be a guest spot.
Wrong again, my friend. It was purely a Save Ferris song. She Has a Girlfriend Now by Reel Big Fish had guest vocals from Monique Powell... but that's the only one on your set where the two bands crossed.
Dammit, yeah. THAT's the one I was confusing it with. Oh, well. I suppose I could replace it with their cover of "Mele Kalikimaka".