Bette Midler has lashed out at Justin Bieber's father.

The 69-year-old singer and actress blasted Jeremy's tasteless tweet praising his son on the size of his manhood after nude photographs of Justin, 21, were released without his consent.

Justin has threatened to take legal action after three full frontal nude photographs of him taken while he was on holiday with British love interest Jayde Pierce in Bora Bora surfaced online but Jeremy is less upset about his son's privacy being invaded.

He took to Twitter to praise the 'Where Are U Now' hitmaker's manhood, tweeting: ''@justinbieber what do you feed that thing. #proud daddy''

And Bette was unimpressed, blasting Jeremy as a deadbeat dad in a message on her own Twitter page which read: ''.@justinbieber's dad tweeted he's proud of his son's penis size. I think the biggest d**k in this situation is the dad who abandoned his son (sic).''

While Justin was initially very unhappy and felt violated by the images, a source told gossip website TMZ that he cooled off after they went viral because he thinks they are very flattering.

The Canadian heartthrob's personal-trainer Patrick Nilsson previously claimed he was ''well-endowed'' despite claims his Calvin Klein underwear campaign had been photoshopped to give him a bigger package.

Speaking last year, he said: ''I can definitely confirm that he is a well-endowed guy. I sound weird saying that, but yes.''