WhodoyouthinkyouarelogoJulie Walters, Brian Blessed, Twiggy and Martin Shaw will help BBC One’s family history series Who Do You Think You Are? mark its 10th anniversary this year.

The show first aired on BBC Two in 2004 and is set to celebrate both its 10th birthday and 100th episode later this summer.

Other celebrities to feature in the new run include Billy Connolly, Sheridan Smith, Tamzin Outhwaite and Reggie Yates.

In addition to the regular episodes, there’ll be a one-hour special giving viewers the chance to re-live some classic moments and highlights.

Leanne Klein, CEO of series producer Wall To Wall Television, said: “For 10 years, Who Do You Think You Are? has shone a light on British and world history through the ancestors of some of our most loved celebrities.

“The fact that it has inspired so many of us to look into our own family histories too is a sign of its enduring popularity.”

Maxine Watson, BBC Commissioning Editor, Documentaries, added: “As we celebrate 10 fantastic years in 2014, another 10 famous faces discover more about themselves through their past.

“The new series promises to continue to deliver BBC One audiences the laughter, tears and surprising revelations of family ancestry as only Who Do You Think You Are? can.”