Motley Crue have teased a huge "surprise" for fans.

Motley Crue

Motley Crue

The heavy metal band have recorded four news songs for their forthcoming biopic 'The Dirt' with legendary producer Bob Rock, which bassist Nikki Sixx says are "ball busters", but the 'Kickstart My Heart' rocker has promised there is much more to come from the group - who quit touring in 2015.

He tweeted: "F**k can I just say it? I'm listening to the roughs of the new @MotleyCrue and it feels real and raw.Everybody is playing like mad and the songs crush. Bob Rock brought the sounds. Plus we have a surprise that will confirm that we're outta our minds. (sic)"

When a fan questioned how "new" the songs could be if they are in a movie about the group's "past", the 59-year-old rock star replied: "You can trust us these are ball busters. Everybody can relax.Were soon gonna smack you upside the head with some killer new tracks. Bob Rock is producing.Its our movie. We know what were doing. (sic)"

'The Dirt' features an all-star cast including Douglas Booth (Nikki), Machine Gun Kelly (Tommy Lee), Iwan Rheon (Mick Mars), Daniel Webber (Vince Neil) and Tony Cavalero as Ozzy Osbourne.

The movie is being helmed by 'Jackass' director Jeff Tremaine, and is based on the band's 2001 memoir 'The Dirt: Confessions of the World's Most Notorious Rock Band'.

Last year, Motley - who retired from the road after their 'The End Tour' - released a special edition of their biggest hit, 'Girls, Girls, Girls, and hinted that more "surprises" are on the way.

The band's 1987 studio album turned 30 in May, 2017, and the rockers took to Facebook to celebrate the milestone.

The 'Home Sweet Home' hitmakers urged fans to sign up to their mailing list for more information.

Sharing the music video for 'Girls, Girls, Girls' on the social media site, they wrote: "HAPPY BIRTHDAY!!!

GIRLS, GIRLS, GIRLS turns 30 today and we'll be celebrating all year long! Sign up at now and get notified first about all the surprises coming up this year and how you can celebrate with us.

Special anniversary edition of GIRLS, GIRLS, GIRLS out August 25! (sic)"

The Crue are still regarded one of the most outrageous rock bands of all time.

Drummer Tommy previously admitted the mid-1980s, when the record was released, was a "bad" time for the 'All Bad Things Must End' hitmakers because they were all "not waking up", "overdosing" and "like a bomb ready to go off".

He said he is amazed the band - who performed their last show as a part of 'The Final Tour' at the Staples Center in Los Angeles on December 31, 2015 - are living to tell the tale and survived, because he was sure "someone was going to die".

He told BANG Showbiz: "People were not waking up, people were overdosing and people were f***king. Like a bomb ready to go off, like someone was going to die. The fact we made it through that is really amazing because we had all of the ingredients for bad and for something to go extremely f***ing bad."

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