Actor Johnny Depp is reportedly keeping a vigil at a London hospital where his seriously ill daughter is being treated.

British newspaper The Mirror reports that the 'Pirates of the Caribbean' star was due to start filming 'Sweeney Todd' at Pinewood Studios when 7-year-old Lily-Rose became ill.

Depp and his partner, Vanessa Paradis, have spent the last nine days visiting their little girl, who is in a "serious condition," according to The Mirror.

The couple lives in France with Lily-Rose and their 4-year-old son Jack.