“Mama, I’ll always be your baby,” said Bieber, after putting out his mother’s flaming hair (PEOPLE.com) — Justin Bieber celebrated his mom’s birthday on stage Saturday night — with some unexpected pyrotechnics. The pop star, 17, surprised Pattie Mallette with a birthday cake at the end of the concert at Berlin’s O2 World arena. But as she leaned over the cake to blow out the candles, a few strands of her hair caught on fire. Bieber quickly put out the flames, and then said, “Mama, I’ll always be your baby,” according to Germany’s Bild newspaper. PEOPLE.com: Justin Bieber’s party pals Mother and son both Tweeted about the incident later. Bieber wrote: “sick show in Berlin…brought @studiomama on stage 2 sing her happy bday but she lit her hair on fire with the candles. lol. i saved her.” Mallette wrote: “Thank u @justinbieber for the cake (& embarrassing me on stage lol).” See the original article at PEOPLE.com.