Just what could eco-campaigner pop star Ellie Goulding and the billionaire founder of Britain's fourth largest energy supplier have to discuss?

I ask because the singer and Ovo Energy boss Stephen Fitzpatrick were spotted chewing the fat last week outside the posh Bodyism wellness centre in Notting Hill, West London.

Ellie, 37, was seemingly minding her own business when Stephen, 46, made a beeline for her. And at one stage he even paid close attention to something on her phone.

Maybe Ellie, who is a UN environment ambassador and keen advocate for green issues, was sharing some of her planet-saving advice with Stephen.

Ellie (right), 37, was seemingly minding her own business when Stephen (left), 46, made a beeline for her. And at one stage he even paid close attention to something on her phone

Maybe Ellie, who is a UN environment ambassador and keen advocate for green issues, was sharing some of her planet-saving advice with Stephen

The businessman came in for criticism last year when he advised customers concerned with rising energy prices to cuddle their pets for warmth. 

Ellie is herself a renowned cat lover and once said one of the most romantic things art dealer ex-husband Caspar Jopling had done for her was building 'a cover for my cat litter tray'.

She split from Caspar, 32 – with whom she shares two-year-old son Arthur – earlier this year following rumours about her close friendship with Tory peer Zac Goldsmith, a fellow eco-supporter. 

Ellie is now thought to be dating surfing instructor Armando Perez, who she met on a trip to Costa Rica in January.

Stephen set up Ovo with his wife Sophie, with whom he has three children. 

He is also the founder of flying taxi business Vertical Aerospace and was recently forced to inject £39 million into the company to keep it afloat.

He also owns Kensington Roof Gardens, previously owned by his business idol Richard Branson.