Chelsea Flower Show attracts a certain sort of celebrity

Bill Nighy is either so impressed he's sending a picture message to all his friends, or so bored he's playing Tetris Photograph: Carl De Souza/AFP/Getty Images

Helana Bonham-Carter took her mum, Elena, with her. Bless. Great hat, Mrs B-C! Photograph: Chris Jackson/Getty Images

Joanna Lumley really is everywhere at the moment, isn't she? Photograph: Nils Jorgensen/Rex Features

Surprisingly, Lawrence Llewellyn-Bowen and his wife Jackie have toned down their outfits to a minimalist monochrome, letting the flowers do the talking Photograph: John Stillwell/PA

Not so Penny Lancaster, who is clashing with the blooms in this floral print. Rod Stewart's got the 'English gent on a spring jaunt' look down pat, though Photograph: Chris Jackson/Getty Images

Helen Mirren finds something she'd like to take home on the Burncose Nurseries stand. We don't think Chelsea works like that, even for dames ... Photograph: Dan Kitwood/Getty Images

Sienna Miller adds a bit of Hollywood glamour to proceedings ... Photograph: Chris Jackson/Getty Images

... while designer Paul Smith is taking it all very seriously Photograph: Chris Jackson/Getty Images

Finally, the sainted Stephen Fry. Could a posh celeb by any other name look as sweet? Photograph: John Stillwell/PA