Yes and if she wore that to the pool no one would bat an eyelid. Or if it had been a video of her in an oversized t shirt stood on the balcony with a glass of prosecco in her birthday no one would have cared really.
But surely you agree it's a bit odd to get up, get your makeup on and do your hair, tuck your t-shirt into your knickers so your bum was on show, ask your fiancé to film you from behind, walk onto your balcony over looking a public street (still in said underwear), then upload that video onto Instagram, THEN get your fiancé to make a comment about how you were too 'shy' to upload it?!