It is surely the most dramatic thing to have happened to horticulture since the invention of the lawn mower: yes, indeed, Sherlock star Benedict Cumberbatch has graced the Chelsea Flower Show with his presence.
Breathless gardening fans at the event were eager to catch a glimpse of the star as he arrived this morning wearing a pink shirt, light grey jacket and sunglasess - in the company his mother the actress Wanda Ventham.
Cumberbatch and his Mum - who plays Sherlock's mother in the hit BBC series - were there to review the floral displays for BBC2's coverage.
The actor, who has said that he relaxes by "roof terrace" gardening, is due to appear in a section of BBC2's coverage of the show called Mum and Me in which he will converse with his mother about the various displays.
Other stars taking parts with their mothers include Strictly judge Darcey Bussell, comedian Julian Clary and actress Emilia Fox.
Cumberbatch's arrival has generated understandable excitement on Twitter.
David Ragg Tweeted:
While obvious superfan @RosiCUMBERBATCH chipped in with :
Another gardening enthusiast, Don Billington, posted a picture of Cumbers drinking from a water bottle (almost as if he were a plant himself) with the words:
For those unable to see Cumbers in person, BBC2's coverage begins at 8pm tonight.