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Alex & Sierra - Little Do You Know

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Alex & Sierra - Little Do You Know (Lyrics)

Alex & Sierra - Little Do You Know (Annie LeBlanc & Hayden Summerall Cover) / Lyrics

Alex and Sierra I Love You - Lyrics

Alex & Sierra - Scarecrow

Alex & Sierra - Say Something (Winners Final Song)

Alex & Sierra - You Will Find Me (Audio)

Alex & Sierra - I Love You (Audio)

Alex & Sierra - Sultry Cover of Britney Spears' "Toxic" - THE X FACTOR USA 2013

Alex and Sierra Back To You - Lyrics

Alex & Sierra - Take Me (Audio)

Alex & Sierra - You Will Find Me (Lyrics)

Alex & Sierra - Broken Frame (Lyric Video)

Britney Spears - Toxic (Alex & Sierra cover)

A Great Big World - Say Something (Alex & Sierra cover)

Alex & Sierra - Broken Frame (Audio)

Gravity by Alex and Sierra Lyrics

Alex & Sierra Sing The "Best Song Ever" - THE X FACTOR USA 2013

Alex & Sierra Perform "Gravity" - THE X FACTOR USA 2013

Sara Bareilles - Gravity (Alex & Sierra cover)

Alex & Sierra "Say Something" in an unplugged performance! - THE X FACTOR USA 2013

Alex & Sierra - "Little Do You Know" (Exclusive Perez Hilton Acoustic)

Destiny's Child - Say My Name (Alex & Sierra cover)

Pranking Boyfriend With "Little Do You Know"-Alex and Sierra Lyrics (FAIL!)

Alex & Sierra - Little Do You Know (Karaoke Version)

Alex & Sierra - Little Do You Know (Annie LeBlanc & Hayden Summerall Cover)

Alex & Sierra Knows Grease Is The Word - THE X FACTOR USA 2013

All Alex and Sierra Performaces on T X FACTOR US 2013

Alex & Sierra TXF Covers

Alex & Sierra - Bumper Cars (lyrics)

Say Something - Alex and Sierra (Lyrics)

Alex & Sierra "Heard It Through The Grapevine" - THE X FACTOR USA 2013

Alex & Sierra Vow To "Let Her Go" - THE X FACTOR USA 2013

Alex & Sierra Get Into "Trouble" - THE X FACTOR USA 2013

Alex & Sierra perform "Say My Name" - THE X FACTOR USA 2013

Top 3: Alex & Sierra Perform "Give Me Love" - THE X FACTOR USA 2013

OUR PROPOSAL! Sierra & Alex

Alex & Sierra Don't Let Go, about Vietnam roots (banter included)

Alex & Sierra | 'you're my favorite person in the world'

Take Me - Alex & Sierra (Lyrics)

Alex & Sierra - Little Do You Know (Speed up)

Simon Cowell Gushes Over Alex & Sierra + Shares Favorite Songs of 2013!

Alex & Sierra - Scarecrow (Lyric Video)

Carlito Olivero Joins Alex & Sierra in a duet of "Falling Slowly" - THE X FACTOR USA 2013

Alex and Sierra Bumper Cars - Lyrics

Gareth Emery feat. Alex & Sierra - We Were Young

Top 3: Alex & Sierra Sing "Bleeding Love" with Leona Lewis - THE X FACTOR USA 2013

Alex & Sierra Cover Robin Thicke - THE X FACTOR USA 2013

Alex & Sierra compil Xfactor USA 2013

Alex & Sierra - All for You Lyrics