This kinda funny -- we've gotta give credit to 15-year-old JoJo Siwa for being able to navigate Rodeo Drive in Beverly Hills in her new West Coast Custom-ized BMW convertible and conduct an interview with an X17 videographer at the same time!

The Dance Moms star commented on her online "beef" with Justin Bieber -- following Biebs commenting on West Coast Custom's Instagram of JoJo with her new car in which he wrote: "burn it."

Siwa said in a reply to Bieber's subsequent apology that he'd have to perform at her 16th birthday to make up for it. Uhhh ... we doubt it, but wouldn't that be crazy?!