Baldwin, 21, could be seen beaming at her man from the crowd and, of course, filming the sweet moment on her phone.
The recently engaged couple were attracting Marriage speculations after photos of them leaving a courthouse together where marriage licences are issued.
The pop superstar and 21-year-old model Hailey sparked rumours they may have tied the knot in secret when they were seen leaving a registry office in NY last week. I've been travelling all over.
"For me, being adventurous is flying by the seat of my trousers, which isn't something I'm normally comfortable with, but I've been doing it for the last few months", she said.
"Well, I got engaged! So that's probably top".
The 60-year-old actor admitted he doesn't know "what the deal is" but revealed the couple, who were spotted at the Marriage Bureau at the courthouse in New York City last Thursday, have tied the knot.
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The model tweeted (and then deleted), "I understand where the speculation is coming from, but I'm not married yet!"
But clearly, Hailey's Uncle, Alec Baldwin, didn't get the memo that the secret wedding was supposed to be kept on the DL because he just let it slip on the Emmy's red carpet yesterday that his niece is already a married woman.
Can someone book Hailey for a gig in Ireland so we might get a random Justin Bieber gig on Grafton Street, please?
As am I! Now I just need to find him so we can fall in love and live happily ever after.
Fans have also speculated that the two of them may have been at the courthouse to obtain a marriage license, which is valid for 60 days in NY state.
An unnamed source told the magazine that the couple "didn't want anyone but their families to know they got married".