Daniel Radcliffe regrets not going wild when he turned 18 - vowing to make sure his 21st birthday will be a "a more raucous affair". The Harry Potter actor's 18th birthday in July (07) was a low-key celebration - he spent the day watching the cricket. But admits his next milestone birthday will be wild. The star told British radio station Heart: "I'm certain my 21st will be a more raucous affair than my 18th, I hope so anyway, why not? "I'm not going to go off the rails though. I'm just going to keep on doing what I'm doing and won't get embroiled in any of that."