Christina Aguilera & Will Ferrell Sing About Their Tight Pants on 'Fallon': Watch

Christina Aguilera can sound good singing anything, so it makes sense Jimmy Fallon would recruit her for The Tonight Show's latest "Tight Pants" skit.

Watch above as The Voice diva and Will Ferrell sing about how proud they are to have the tightest pants in the land. Look out for Xtina's spot-on Zulu to sing the opening notes of The Lion King's "Circle of Life" ("Nants ingonyama bagithi Baba!").