Johnny Depp explained he believed it was "responsible parenting" because he didn't his daughter to have a bad experience while he wasn't there.

Johnny Depp said he gave his daughter Lily-Rose marijuana when she was 13. It has come to light in court as the actor, 57, is suing News Group Newspapers over a story published in The Sun in 2018 which branded him a "wife-beater" - a claim he denies.

The trial kicked off at the High Court in London with both Depp and his ex-wife Amber Heard, 32, in attendance. Johnny took to the stand to give his testimony and his witness statement was presented in court on Tuesday.

In his testimony, he defended his decision to give his daughter drugs. The dad said he wanted the aspiring actress, now 21, to have a safe experience with the drug in her early teenage years.

Johnny explained he believed it was "responsible parenting" because he didn't want his daughter to have a bad experience while he wasn't there.

READ ALSO: Amber Heard 'was serially violent to Johnny Depp and concocted abuse hoax' his lawyer claims

The Hollywood star raises his children Lily-Rose and Jack, real name John Christopher Depp, 18, with his ex-Vanessa Paradis.

Johnny and Vanessa were romancing from 1988 until their separation in 2012. Vanessa has been called as a witness in the case.

Depp denies all allegations he was violent towards his ex-wife Amanda.

The couple were married in 2015 but they went their separate ways a year later in 2016.

The case continues.