As the current incarnation of Doctor Who, it seems that actor David Tennant can't help taking his work home with him.

He has already had three romances with colleagues since taking over the controls of the Tardis in 2005.

And Georgia Moffett makes four. Miss Moffett, a 23-year-old single mother, played the Doctor's daughter Jenny in the current series.

To complete the Who connection she is the daughter of Peter Davison, who played the Time Lord between 1982 and 1984, and American actress Sandra Dickinson.

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Low-key: David Tennant and his new girlfriend Georgia Moffett leave his north London home on Saturday morning

Tennant, 37, and Miss Moffett were photographed leaving his North London house
after spending the night there on Friday, before meeting on Saturday night at her West London home. He did not leave until Sunday morning.

He has a record for romancing his leading ladies and members of the film crew and his relationship with Miss Moffett is merely the latest in line of on-set liaisons on Doctor Who.

In April, he was reported to be dating second assistant director Jennie Fava, who moved to Cardiff to help film the latest series of the hit BBC1 programme which has been running since 1963.

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New love: The couple have been quietly dating over the last few weeks, according to friends

Weeks earlier, he split with another BBC Wales staff member, Bethan Britton after a four-month relationship.

When the pair met she had been working in the corporation's contracts office in the city when they met.

He was also linked to Kylie Minogue after the pop star appeared in the Christmas special, which featured a passionate kiss between the pair.

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Who's Who of girlfriends: Tennant dated Dr Who's second assistant director Jennie Fava

Last October, Tennant parted ways with actress Sophia Myles after a two-year relationship, following her move to Hollywood.

Work romance: Tennant also had a four-month relationship with Bethan Britton (pictured) another BBC Wales staff member

They, too, met on set - when Miss Myles played Madame de Pompadour in a 2006 Dr Who episode.

Miss Moffett played the Time Lord's child Jenny in episode six of the current series entitled The Doctor's Daughter and while it was a one off appearance, the opportunity for her to return in later shows has been left open.

The actress, who has a six year old son named Tyler from a previous relationship, revealed after first meeting Tennant: 'David is dishy, isn't he?

'He's not only a good-looking but he is such a lovely, sweet guy.'

Mr Tennant has been nursing his personal heartache after his mother Helen died after a five-year battle with cancer last summer

A spokeswoman for Mr Tennant said:

'We do not comment on David's personal life.

David Tennant and Peter Davidson met for a Doctor Who special for Children in Need

Tennant's Girls

Georgie Moffett

Age: 23

Miss Moffett is an up and coming actress, whose previous credits include, Where The Heart Is and The Bill.

The blonde beauty is the daughter of former Doctor Who Peter Davison and American actress Sandra Dickson but is keen to make her own name on screen. Tennant is almost 15 years her senior but her friends say that Moffett is more mature than her age, particularly as she is a single mother to six year old son Tyler.

Jennie Fava

Age: 27

Miss Fava is second assistant director on the latest series of Doctor Who, but also worked on shows such as Extras and The Chatterley Affari.

Traditionally a man with an eye for blondes, Mr Tennant made a departure from type when he dated Miss Fava for a few weeks in April.

The exotic brunette helped him celebrate his birthday and the pair were spotted on a string of romantic dates in Cardiff, including a concert where co-star John Barrowman was performing.

Bethan Britton

Age: 28

Miss Britton is a Contracts Assistant at BBC South Wales.

The striking blonde caught Mr Tennant's eye when she made a visit to the set of the Sci-fi show late last year. The couple struck up a relationship just a couple of months after his split from long-term love actress Sophia Myles.

She still lives at her parents house on the outskirts of Cardiff so much of their four month relationship was spent at his city flat.