Perhaps feeling inclined to live vicariously through her eldest child, the 55-year-old pop queen wrote, 'Pre prom turn up!' in a caption alongside the photo, before adding a rather youthful hashtag to go with it: '#yaaaaaassssssb****'
Lourdes looked elegant in a classy dress and bright red lips, and - as always - bore a striking resemblance to her famous mother.
The actual prom itself was next, and here Lourdes must have danced the night away because she was later spotted getting a piggyback from her friend at the end of the night.
The brunette gave her feet a rest as she hopped on the back of her male companion to make her way through New York with friends.
The talented teen is about to receive her diploma from LaGuardia High School and the budding fashion designer recently opened up on some of her awkward clothing choices in a new post for Material Girl, the clothing line she and her famous mom design.
Lourdes was both reflective and funny as she described an outfit she wore three years ago.
Killer heels: The 17-year-old was seen giving her feet a rest as she hopped on the back of her male companion as she made her way through New York with friends
'Looking back on the past four years of high school means looking back on unfortunate outfits I wore confidently to school (good for me),”' Lourdes wrote.
'Oh how I wish I could go back in time and urge my 14-year-old self NOT to wear black rhinestone studded t-shirts with bloody skulls on them…'
Madonna's first-born child remained optimistic as she refused to limit herself when it comes to style.
'I had to go through that awkward time of "trying stuff out" to figure out what I liked wearing best,' she went on. 'I still don’t think I have a defined style, maybe because I don’t want to limit myself to what I should wear.'
'As summer approaches and as I keep forgetting to shave my legs… I greet with open arms crop tops, Adidas sandals, fun bucket hats, and just walking around with no pants on and it being ok.'
Lourdes confessed that finishing high school at last has caused some butterflies to flutter when thinking about the future.
'I was so excited about ‘being done with school’ and now that I’m actually done I’m like clammy and sweating and nervous because... WHAT?!?!'
'Can’t believe I was just starting high school when we launched MG and now I am graduating! These looks will hit Macy’s when I am a college freshman,' Lourdes excitedly wrote.
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What do you remember about your high school prom ONTD?