Get out your tissues.
We know you're probably thinking, "There's no way a YouTube video is going to make me cry." But seriously, get out your tissues: Because 10-month-old Mary Lynn Leroux's reaction to her mom singing is heartbreakingly adorable.
"Mommy's going to sing a song," Amanda Leroux coos to a giggling Mary Lynn at the beginning of the video. "You want mommy to sing a song, honey? Let me know how you feel about the song."
Amanda launches into Rod Stewart's "My Heart Can't Tell You No"...