VIDEO: Fifth Harmony's Ally Brooke & Echosmith's Sydney Sierota Mash Up Two Christmas Songs!

VIDEO: Fifth Harmony's Ally Brooke & Echosmith's Sydney Sierota Mash Up Two Christmas Songs!

Ally Brooke and BFF Sydney Sierota are back at it again!

The two musicians reunited for a little Christmas song mash-up with “Baby, It’s Cold Outside” and “Silent Night” — two songs that we never thought would mash up, but totally do!

PHOTOS: Check out the latest pics of Ally Brooke

Ally and Sydney also teamed up earlier this year and performed “Time After Time” together.

WHAT DO YOU THINK of Sydney and Ally’s mashup?

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