Meanwhile, the 21-year-old model and her 24-year-old Baby singer are in the United Kingdom for Hailey's Falcon Catwalk Show with Adidas Originals.
Alec Baldwin's comments come days after the young model tweeted to deny multiple reports that she and Bieber Wednesday.
Justin and Hailey captured a lot of fan attention during their West End appearance, with phones at the ready as many hoped for a chance to get a prized selfie. Alec was asked. "Well, they went off and got married!" he revealed. We text Hailey every now and then.
"I understand where the speculation is coming from, but I'm not married yet!" she wrote on Twitter Friday in a since-deleted tweet.More news: Vikings sign Dan Bailey as kicker
Their PDA session comes following rumours that they are already married after they were spotted at the Marriage Bureau in NYC.
Bieber popped the question to the model in July, around four months after splitting from previous girlfriend Selena Gomez.
Representatives for Bieber and Hailey Baldwin did not immediately respond to HuffPost's request for comment.
"She has a dad and I'm sure he has a few paragraphs about that himself so I'm not anxious (about giving Justin a talking to)", Alec smiled.
Hailey look totally on point, flashing her toned abs in a tiny crop top, PVC pants and denim jacket.