As if Justin Bieber isn't getting enough of a ribbing in the press at the moment (all brought on by himself, of course) his ex-girflriend has just added insult to injury by joking on The Late Show with David Letterman about how unaffected she is by their break up. She even took the piss about crying; we're lead to believe she hardly wept a single tear when parting ways with the Beebs, whereas he was the one in floods. Naww, poor Justin. What's more, a source has put it out there that Selena is pure morto about Justin's behaviour since their split. Sure you could set it to music at this stage.

The 20-year-old actress and Justin, 19, went their separate ways in January after two years together and while the 'Spring Breakers' star feels 'good' about being single, her pop star ex-boyfriend may not share her positive mood.

Appearing on 'The Late Show with David Letterman' last night (18.03.13), the host said: 'Last time you were here, you were with a Justin Bieber. That's not going on now.'

Selena replied: 'No, I'm single. I'm so good.'

Letterman, the oul charmer, went on to claim he had upset Justin to the point of making him cry the last time he had appeared on the show, prompting Selena to reply: 'Well then, that makes two of us.'

It was recently claimed Selena is keen to date an older man following her split from 19-year-old Justin. And we kinda reckon she'd have her eye on someone like James Franco, her 'good friend' who took the mickey out of Bieber with his video rendition of Boyfriend.

The source said: 'Selena is looking to date an older man this time. She finally sees how toxic it was to date a toddler like Justin... Selena is doing really well and feels like a weight has been lifted off her shoulders now that Justin is out of the picture. She finds Justin to be embarrassing since their breakup. He's turned into exactly the kind of person she'd never want to be with.'