Singer Justin Bieber has reportedly taken the decision to give up alcohol and "bad influence" friends.

According to sources, the wild-child "Baby" hitmaker, now 20, has grown up and swapped getting drunk for cooking recipes, reports mirror.co.uk.

Bieber has also ditched "bad influence" friends in favour of quiet nights in with girlfriend Selena Gomez.

Sources say he is so settled they wouldn’t be surprised if the couple were to wed soon.

"Justin has moved on to the next chapter of his life. He wanted to put all the bratty child and bad boy stuff behind him. So, he took the decision a few weeks ago to grow up," said a source.

"He didn’t want to be a naughty kid any more and recently has been so good. He has given up alcohol - he knows it’s not good for him. In 2013 and the start of 2014, which he regards as a bad time for him, he hung around with some pretty undesirable people.

"That has all gone. Now he sees one of his old gang, Lil Twist, but only in his home. He has found a true hobby in cooking and has built up a collection of recipe books," added the source.