Selena Gomez allegedly branded Justin Bieber a ''drug addict'' and urged him to ''go to rehab''.

The singer-and-actress - who is believed to have rekindled her romance with the 'Believe' hitmaker - lashed out at the 19-year-old star in a text message row which saw him send her x-rated nude photographs.

The messages, which were reportedly forwarded from a phone registered to Selena's stepfather, Brian Teefey, to one of her friends, begin with Justin saying: ''Baby come on. I love you.''

However, his on/off girlfriend responded with a furious attack, writing: ''I don't buy that bulls**t any more. I was honest with you and I gave you a second chance. All my friends were right, You're such an a**hole.''

Justin replied: ''You're all I need right now. I know I can make it right with you.''

Selena hit back, writing: ''U r a drug addict. U need help.''

According to who obtained the messages, Justin then sent a photo of his manhood, writing: ''Come on. Don't tell me you don't miss this.''

Selena replied: ''Stop it. You need to listen to Scooter [Braun, his manager] and go to rehab. U r sick.''

The 'Baby' singer - who is being investigated by police over an egging attack on his neighbour's home - then sent another explicit photograph and wrote: ''''Rehab? F*ck that! I make that f***er so much money.''

Upon receiving the picture, Selena told the star they are ''done'' and suggested his friend Lil Za - who was arrested last week for drug possession following a police raid on Justin's home over the egging attack - had ''taken the fall'' for his behaviour.

She wrote: ''And how can u let [Lil Za] take the fall or your actions. U need to grow the f**k up. I hope you get jail time. U deserve it at this point.''

After the 21-year-old starlet also advised the 'Never Say Never' star to ''retire'', he appeared to see red and launched a foul-mouthed attack on her.

He wrote: ''F**K YOU!!!!! I need to grow up?! HA ok! Enjoy life with OUT ME B***h!!! F**k you. F**k Scooter. F**k all y'all. IAM DONE!

''Can't hear you over my cash, babe! You're only famous cuz of me. You know it. I know. Everybody knows. Bye ... Go f**k someone else. Keep that talentless p***y away from me!''

Meanwhile, it has been claimed there were drugs and drug paraphernalia - including two large cookie jars filled with marijuana - ''strewn all over'' Justin's mansion when police raided the property.

According to gossip website TMZ, the star also has a ''dedicated smoking room'' in his house.

However, police didn't seize any of the items because they were primarily looking for video equipment and it is likely a search of jars and other items would have exceeded the remit of their search warrant.