The Easy On Me singer and sports agent jetted over to Cleveland, Ohio on Sunday to attend the star-studded game.
Sitting courtside, Adele, 33, looked chic with a double layer of leopard print in a long coat and matching top, while Rich, 40, wore a letterman jacket with jeans. The couple, who began dating last year, were all loved-up as they snuggled into each other during the game and held hands while leaving the venue.
At one point, the British star momentarily broke away from her boyfriend to catch-up with Mary J Blige, with the musicians taking photos together.
Eagle-eyed fans will notice Adele wore a band on her left hand but it appears to be different to the diamond ring she wore at the Brit Awards earlier this month, sparking engagement rumours.
Graham Norton addressed the noticeable bling when the singer appeared on his talk show days later, and said: ‘I don’t know if anyone noticed but on Tuesday night [at the Brit Awards] when you were sat at the piano singing.
‘You had the microphone in your right hand, I felt your left hand didn’t move as much as normal. It seemed heavier than normal… Is there something?’
Adele burst out laughing as she told him: ‘As if I would ever tell anyone if I was or wasn’t [engaged]!’
Showing off the ring, she added: ‘Lovely though, isn’t it?’
Graham, 58, then added: ‘I have to say, as a casual observer, it looks like you are,’ to which Adele laughed loudly and added: ‘Alright!’, giggling as Graham joked: ‘I’m taking that as a yes!’
She then dropped the bombshell comment: ‘Imagine if I have to cancel because I am having a baby!’
Adele began dating Rich last spring following the end of her marriage to Simon Konecki.
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