As the Time Lord's faithful assistant, actress Jenna Coleman might as well have been granted eternal youth.

Because the Doctor Who starlet, who plays Clara Oswald to Peter Capaldi's The Doctor, was looking fresh-faced and gorgeous as she marked her 29th birthday on the Penarth, Wales set on Monday.

Jenna fought off the chill in a padded jacket while ever-so coolly layering on her oversized shades, as an enthusiastic Peter, 57, gave a wave when he arrived in his own statement specs.

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Youthful: Jenna Coleman turned 29 on the set of Doctor Who on Monday, as she joined cast mates to film the new series

Jenna and Peter are filming new episodes for the 2015 series 9 at the moment but broke away to sing Happy Birthday as the actress was spending her special day working.

Regardless of her circumstance, she appeared to be in high spirits and smiled as she clutched a hot drink in one hand to make a relaxed entrance to the set.

A silver-haired Peter was especially immersed in the drama nonetheless and made notes as he walked around in a pair of jazzy checkered trousers.

Birthday girl: The beauty gave a smile as she arrived on the Penarth, Wales set at the start of the week

Ready for action: Birthday girl Jenna hid beneath large sunglasses as she prepared to shoot more scenes

Working on her birthday: The actress seemed in high spirits, despite having to work on her birthday

Back into the swing: Jenna interacted with the crew and cast when she hit the outdoor set

The Doctor has arrived: Doctor Who actor Peter Capaldi gave a wave as he prepared for a new day of filming

Doctor Who writer and producer Steven Moffat recently said that Peter is at the top of his game as he returns for a second series of the supernatural drama.

Steven said of the actor: 'He is on amazing form at the moment. I was looking at some of his first series stuff and thinking ‘it’s magnificent, but it’s nothing compared to what he’s doing now’.

Filming began for the show in January and the latest installments will air in Autumn 2015 with Jenna and Peter reprising their roles.

On location: The actors set up camp in Penarth, where they're said to be filming 'period adventure'

Consumed: Peter was seen walking around the set with a pen and paper in his hand, making notes

Keen: Writer and producer Steven Moffat said Peter was on his best form as he returns for a second series

Getting stuck in: Peter was pictured interacting with the cast and crew as he got to grips with the scene

Glad to be back: The Doctor will be played by Peter for a second time this Autumn 2015

Though the duo weren't in attendance, Peter and Jenna's show scooped the Special, Visual and Graphic Effects award at Sunday night's Bafta Craft Awards, proving that series 8 had been something extra special.

Some of the standout moments from the previous series included a Tyrannosaurus Rex in the Thames and a giant alien creature hatching from the moon.

The duo are currently filming two episodes in Wales, The Girl Who Died and The Woman Who Lived, which have been confirmed as featuring 'period adventure'.

In costume: Two of the extras were seen in period costume as they walked through a village of thatched properties

Back in time: The costumes suggested that there might be a special theme to the two parts they're filming

Special effects: Doctor Who walked away with the Special, Visual and Graphic Effects prize at Sunday night's Bafta Craft Awards

Into his stride: Peter certainly appears to be getting to grips with his interpretation of The Doctor

Two part drama: The episode that they're currently filming is thought to be aired in two parts