Justin Bieber is celebrating his freedom a year after he found himself in a jail cell following his arrest in Florida.

The 21-year-old pop star was detained by cops in Miami Beach in January, 2014 after he was caught taking part in a suspected drag race and he spent a night behind bars before being freed on bail.

He later pleaded guilty to charges of careless driving and resisting arrest and was sentenced to anger management counselling and ordered to hand over a series of fines.

Bieber marked a year since his brief spell in jail during an interview with America's Men's Health magazine, and the Baby singer insisted he is now a changed man.

He tells the publication, "This has really been a big year for me, as far as figuring stuff out. This is almost like a full 180 from how I was. Yesterday - a year from yesterday - I was in jail. I had to grow up so quick... You feel like you wanna grow up and you gotta prove yourself. Hey, man, you don't need to prove yourself. I didn't know that, though. It's good to really take a step back and be appreciative and understand that life brought me to an incredible place."

Bieber is on the verge of making a music comeback after years of troubles, which also included a vandalism conviction for throwing eggs at a neighbour's house, a number of nightclub brawls, and an embarrassing video which showed the star urinating into a mop bucket in the kitchen of a New York restaurant.