The caption said: "Thank you @cher for the attractive "I got you babe" proposal lead in, you sounded incredible as always". "I got you babe!" the music icon, 70, said in the video, referencing the lyrics from her 1965 collaboration with late husband Sonny Bono.
Celebrity florist Leatham, 46, pulled out all the stops with a candlelit pathway decorated with rose petals that led to a red heart, also made out of roses. "Jeff, you're crying. You're the sweetest person in the entire world".
"I have known Jeff forever, and he is just fantastic, and I think they are going to be really happy and I am excited for them", Cher told ET.
The actor came out as gay in 2016 and announced his relationship with the celebrity floral designer just last month.
"It took me so long to get to this point, but I'm doing so good", he added at the time. "And this is going to be the best thing ever, and you have to call me to tell me how it worked out, alright?"
He said: "People want you to be that GQ image that you put out, but people don't realise what it's like to act 24 hours a day".