Sam looked genuinely touched when Ellen presented him with the gifts after he swept up four gongs during Sunday night's Grammy Awards.
Speaking to Ellen on her US chat show, 22-year-old Sam said: "It's ridiculous. They're so heavy as well. It's unreal. I genuinely didn't think this was going to happen. It's incredible. I keep spontaneously crying."
The 'Stay with Me' singer also referenced his recent split with backing dancer Jonathan Zeizel.
He told Ellen: "I was recently [seeing someone] but I split up with them about three weeks ago. I couldn't bring out In The Lonely Hour and go to the Grammys with someone, I had to be lonely for the Grammys!"
He joked soon after: "I've just got to make sure my next boyfriend can polish my Grammys for me!"
Comedian Ellen, who often gives personalised gifts to her guests, presented British singing sensation Sam with a diamond print onesie with the words '4X Grammy Award Winner' written on it.
And to top it all off, Ellen brought out four decorated shelves adorned with photos of herself and Sam. "No way," gushed Sam. "That's incredible. That's the most beautiful thing. Thank you so much."
Sam's Grammys were for Best New Artist, Best Pop Vocal Album, Song Of The Year and Record Of The Year.
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Watch Sam's interview with Ellen in the video below: