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The reality star, 40, took boyfriend Rami Hawash, 45, and then shared clips on Instagram of their night out at Nusr-et, Knightsbridge.
In a video, Bae can be seen slicing meat covered in gold leaf and sprinkling salt using his signature flamboyant method - by dropping it from his fingertips to his forearm, and then on to the dish.
The cook - whose method of seasoning steak turned him into an internet meme in 2017 - then handed Collins a slice on the end of a knife to sample before leaving the table.
Despite the clip showing the couple in good spirits, former The Only Way Is Essex star Collins now says she was mortified by the mammoth bill.
She told The Gemma Collins Podcast: “I have to give the ambience of the restaurant, the experience, a 10 out of 10.
“The bill was another situation, I was in utter shock. But you have to weigh these things up, the press reported that my steak cost £700, if only they knew.
“I wish it cost £700. It actually cost £1,450.”
Gemma said she felt “sick” the next morning when she remembered how much she had spent at the restaurant.
She added: “I went a bit over the top, but the only way I can justify it was that I haven’t been on holiday this year.
“I’ve been on a staycation, so we sort of had maybe all our holidays in one evening.
“It’s something I’ve never done before, I would never spend that money, but we had a good evening.
‘Yes we had 24 carat gold steak...I felt a bit sick.
‘It was an amazing experience, I would have paid that to meet him anyway because I love him, and it’s a once in a lifetime opportunity.
‘But I started to feel really bad the next day because there are people starving in the world. I just started feeling really bad about it all.
“I told all my friends and family that we won’t be eating out for a long time, not at those prices.
“I love Rami’s steaks the most and I’m going to treat him and me to some gold foil off the internet for £4.99.”