Bill Russell Blows Out 87 Candles On Birthday, 'I'll Kick Its Ass!'

NBA legend Bill Russell turned 87 on Friday -- and celebrated by blowing out a "small forest fire" on his birthday cake ... and the video is great!

The Hall of Famer -- who won 11 championships during his NBA career (eat your heart out Tom Brady!) -- had Shawn Kemp Jr. on standby with a fire extinguisher in case things got out of control ... but in the end, Bill handled it on his own!

With a few deep breaths, B-Russ took down all 87 candles ... and when asked how it felt to be 87, he replied, "I'll kick its ass!!"

Afterward, the Boston Celtics legend joked about the celebration.

"Whew, I made it to 87! I want to thank my wife for another amazing cake & the small forest fire upon it," Russell said.

"Thanks [Shawn Kemp Jr.] for standing by with the extinguisher just in case, next time bring a CPR kit."

Russell is one of the greatest players in NBA history -- an 11-time NBA champion, 5-time NBA MVP, 12-time NBA All-Star ... and the NBA Finals MVP Award is named after him.