Justin Bieber & Stevie Wonder's "Someday at Christmas" Duet

Joining in on the many holiday concerts taking place this weekend, Justin Bieber was among the illustrious performers at Stevie Wonder's 16th annual House Full Of Toys benefit concert in Los Angeles on Saturday night (December 17).

Held at Nokia Theatre L.A. Live, the 17-year-old Canadian sensation joined alongside Stevie to treat the crowd to a rendition of the holiday classic "Someday at Christmas".

After the duet, Bieber continued on to offer up acoustic versions of songs including "Mistletoe" and "Baby," as well as the Chris Brown penned track "Christmas Eve".

Following the stage effort, Justin took to Twitter, writing, "so 4 years ago I sang this song in my hometown. now 4 years later I sang it 2nite with STEVIE WONDER! #NEVERSAYNEVER"

He thoughtfully added, "blessed and grateful. i love all of u and please show respect to eachother and others that i care about. be there for one another."

Enjoy the pictures of Justin Bieber and Stevie Wonder at Stevie Wonder's 16th annual House Full Of Toys benefit concert (December 17).