Continuing his well-documented penchant for sweet charitable deeds, Justin Bieber recently lent his heart of gold to the reality show “Knock Knock Live” by giving his superfans life-changing surprises.

The Ryan-Seacrest produced show — which premiered last week featuring fellow do-gooder David Beckham — aims to help deserving, ordinary people by doling out prizes and giving them near-heart attacks when celebrities literally knock on their front doors.

For his appearance on the show, Justin surprised not one, but TWO deserving fans — and judging by these sneak peek clips, things are about to get real emotional, real fast.

In the first clip, the 21-year-old surprised a fan named Ashley with her very own Quinceanera party (a Hispanic tradition that celebrates a girl’s 15th birthday). Dressed to the nines in a glam ballgown, Ashley basically gets to live every Beliebers’ fantasy: having Justin himself grab her hand, escort her to his giant car, scream “I LOVE ASHLEY” out the window for the whole world to hear, and then celebrate her birthday together. Lucky girl!

In the second clip, Justin bombards a local church to surprise a father and his young son, Noah, who has Down’s Syndrome. This one definitely requires a plus-size pack of Kleenex — after knocking on their door (although Justin’s knock is more of a “KNOCK KNOCK POUND POUND KNOCK,” but that’s beside the point), JB leaves the unsuspecting family screaming in pure exhilaration.

Once the disbelief of seeing Justin in the flesh subsides, Noah and his dad show off their impressive and adorable rapping skills as Justin vibes out on the sidelines. “For me, being able to just witness that is… it almost brought tears to my eyes,” Justin admits. Awww.

Justin took to Twitter this morning to share his excitement about the episode, posting some cute pics from the surprises and gushing that giving back to people is the best feeling.

Justin’s episode of “Knock Knock Live” airs tonight (July 28) on FOX. The rest of the season includes a star-studded lineup of celeb guests, including Ariana Grande, Lea Michele, Meghan Trainor, Rita Ora, Robin Thicke, and Common. Oh, and then there’s MTV’s own “Teen Wolf” hottie Tyler Posey, who’s a co-host on the show. Soo, yeah, we’re thinking this one’s a must-watch.