Selena Gomez and Justin Bieber cuddle up at the Vanity Fair bash

Justin Bieber celebrated his 17th birthday with new girl Selena Gomez this week - but what was a romantic dinner for 2 ended in a squabble with the paparazzi.

The couple were caught in the crowds of photographers as they left an LA restaurant, with Selena covering her face - sparking rumours she'd been accidentally hit.

Naughty teen heartthrob Beebs then stuck up his middle finger to the cameras.

'Had a great bday and at the end of the night we got surrounded by paps and i reacted in a way i know better,' Justin Tweeted on Wednesday. 'Im sorry. 

'It's not always easy but i know better than to react in anger.

'I will make my mistakes but i promise 2 continue 2 grow with u and
try 2 do. 

'Life has it's ups and downs but u guys r always there 4 me.'

The couple were also snapped kissing and cuddling on a shopping spree, with Justin - who's now in the UK for his tour - whipping out his credit card in Beverly Hills' Louis Vuitton store.  

A rep for Disney star Selena told People there is 'absolutely no truth' to the rumours she'd been hit.

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