The 'Shape of You' hitmaker treated the 69-year-old music legend to a Michelin star meal at the Welsh capital city's finest eatery, the Park House restaurant, costing £29, after playing his second sold-out concert at the nearby Principality Stadium.
Whilst Lionel enjoyed locally-sourced Brecon lamb, Ed chose not to eat and simply ''relaxed'' with a few glasses of 1997 Penfold Grange vino - which he'd seen on the menu before booking a table - until the early hours.
The pair had the full run of the oak-panelled 19th-century mansion's dining room and wine bar as the owners ''closed it off'' to the public.
Spokeswoman for Park House, Sian Gunney, told WalesOnline: ''Ed obviously knows his wine.
''His PA rang and made the booking and Ed actually spoke to the staff himself.
''They were both so down to earth and relaxed, they didn't have a demanding list of things they wanted.
''Ed didn't eat, he must have been so pumped with adrenaline.
''But he must have looked at the wine menu before he came because he knew exactly what he wanted.
''He went straight to the wine bar.
''Park House is a family-run business and everyone was so excited when they found out, but they were so professional the entire time.
''They wanted the guys to have a relaxed experience.
''Staff closed off the restaurant to the public so they had the restaurant and wine bar to themselves and even had a tour.''
The 28-year-old pop star had shared a photo of the pair standing on the steps of the restaurant on Friday (22.06.18), with a bottle of the fine wine in shot.
Alongside the picture, Ed wrote: ''Lovely dinner last night with this fine chap.''
The pair were no doubt discussing their forthcoming collaboration.
The 'Hello' hitmaker revealed at the Ivor Novello Awards in London last month, that he has asked the 'Lego House' singer to go in the studio with him and record a track after they hit it off at the awards ceremony - and that they were going to make it happen around their tours.
Talking about himself in the third person, Lionel said ''The next big project for Lionel is - I shouldn't say too much - but it involves Ed Sheeran. I was a little dumbstruck meeting him tonight. There's Ed over there and he's looking at me and I'm looking at Ed. It's a mutual admiration society. The first thing you say is, 'Do you think you might want to . . . ?' And the answer was, 'Of course.' He's on tour and I'm on tour but it will happen.''
The Lumineers honour their friend and hero Tom Petty with a sensational cover of his 1996 song 'Walls' from the 'She's the One' soundtrack.
Watch Olly Murs get his nerd on as he blags his way into an exclusive Snoop Dogg party (where Rowan Atkinson is the bartender) in the video for their...
Mariah Carey is the picture of glamour in the black and white video for her brand new single 'With You'. It's the lead single from her forthcoming...
Eminem draws attention to the negative response his 2017 album 'Revival' received in the video for his latest song 'Venom'; a song recorded for the...
Up and coming LA singer-songwriter Billie Eilish has unveiled her fourth single of the year, 'When the Party's Over'.
As it's been 12 years since the last Bridget Jones movie, expectations aren't too high...
Bridget has always known how to get herself into a muddle - catastrophic muddles at...
After battling the dating scene and finally finding love with Mark Darcy, Bridget Jones is...
In July of 2015, Ed Sheeran played his biggest gigs to date, selling out Wembley...