Alec popped the question to 28-year-old Spanish girlfriend during a trip to the East End of Long Island over the weekend.
The actor’s representative told Us Weekly magazine: ‘Yes, it’s true! Alec proposed to Hilaria this weekend and we’re all excited for the newly engaged couple. Alec‘s birthday is tomorrow. Great way to celebrate!’
Baldwin, who turns 54 tomorrow, is 26 years her senior.
Alec and Hilaria, 28, have been a couple for almost a year and first appeared in public together at several bashes in New York in May 2011.
The couple has not set a date for the wedding. It will be the first marriage for Thomas and the second for Baldwin, whose previous marriage, to Kim Basinger, ended in divorce in 2002.
Thomas was born in Mallorca, Spain, grew up between Boston and Spain, studying dance and history at NYU. Thomas is now a yoga instructor and co-owner at New York‘s Yoga Vida yoga studio.
In recent months Baldwin has been sporting a noticeably trimmer physique, perhaps in a bid to appear more youthful alongside his younger partner.
Things had been getting more and more serious between Alec and Hilaria for months, and the actor recently revealed he was considering having children with her
He said: ‘Have I thought about having more kids? Oh sure, that would be great, that would be heaven, that would be fantastic.’
He jokingly added: ‘As my friend said to me, “When you have children, typically in a second marriage, when you’re older and you get married again to a woman who would have children, you must always remember that you make sure the children attend a college where the commencement ceremonies are held in a facility with a wheelchair accessible ramp”.’
Last August he sold his home in the Upper West Side of New York and moved in with Thomas in the city’s SoHo district.