Blonde Kristen Stewart & Robert Pattinson's date night

A lighter-locked K-Stew and her Twilight beau were snapped leaving a famous Hollywood eatery together last night

Their relationship might be Hollywood's worst kept secret, but it seems that Robert Pattinson and Kristen Stewart are still determined to keep their romance under wraps...

SEE OUR TOP ROB & KRISTEN MOMENTS HERE!

The pair looked less than pleased as they were spotted coming out of hot Hollywood eatery Ago last night, putting on their best frowns for the waiting photographers.

With Kristen hiding slightly behind her beau, the pair tried to avoid getting snapped, and hurriedly jumped into a cab together to escape all the attention.

The Twilight twosome had been enjoying a dressed-down date night at the famous Italian restaurant - part owned by Robert De Niro and loved by the likes of Rihanna - with Rob casual in a checked shirt, and Kristen showcasing her usual laidback look of jeans, trainers and a leather jacket.

And try as she might to hide it under her hood - we also couldn't fail to notice Kristen's newly blonde locks...

The actress has been going gradually lighter over the last couple of months in preparation for her latest role in On the Road - which she's been busy filming over in Montreal.

Gone are those dark, Bella Swan tresses, in place of a much brighter, honey-hued 'do - but we're assuming she'll have to revert back to brown once she hits the Twilight set again...

The pair are obviously making the most of the gaps in their hectic schedules before filming of Breaking Dawn kicks off next month - having also been seen enjoying a romantic night out over the weekend.

The pair were at the swanky Soho House in LA on Saturday, and were spotted 'stealing quick kisses' over their meal as they dined out with pals.

'After dinner, Rob, Kristen and their friends moved to the patio where the group was smoking and the guys were drinking,' a source told E! online.

'Everyone was laughing and having a good time together, but you could tell Rob was doting on Kristen and making sure she was comfortable.

'They were next to each other everywhere the group went.'

SEE OUR TOP ROB & KRISTEN MOMENTS!

LOOK BACK OVER KRISTEN'S HAIR & BEAUTY HISTORY HERE