Hollywood actress Gwyneth Paltrow has been spotted taking the Tube in London. The 36-year-old caught the Jubilee Line to see her Coldplay frontman husband Chris Martin play at the O2 Arena in the Docklands. Paltrow is not new to the catching the Tube. In her 1998 film Sliding Doors, she played a character whose life is split into two parallel universes based on whether or not she misses her train. James Blunt has admitted he also uses public transport. "I actually played at the O2 about a month-and-a-half ago and I came here on the Underground. But today I came in the car and it was a lot harder so I think I'll catch the tube back," he said.