The 28-year-old Oscar-winning actress and the art dealer, 34, celebrated their engagement on Sunday at a glam event attended by their families and friends, according to a source.
Lawrence and Maroney were photographed heading to the festivities in New York City on Sunday, with Maroney wearing a blue suit, gray tie and brown leather shoes.
Styling partners Jill Lincoln and Jordan Johnson shared a photo of the actress on their Instagram page on Monday. Lawrence wore a L. Wells Bridal dress called the Juliana, which features a plunging neckline and full-length sleeves.
"Congrats to the soon to be Mrs. Perfect JL looking like a dream in the Juliana dress," the caption by L. Wells Bridal read.
Lawrence completed her outfit with a Roger Vivier purse, earrings from Leighton Jewels and Casadei shoes.
A rep for the actress confirmed to PEOPLE she and Maroney were engaged in February. Page Six TV first reported the news after the Oscar winner was seen wearing a "massive ring" during dinner with Maroney at Raoul's, an upscale French restaurant in New York City.
A source told PEOPLE in February one reason the pair make a great couple is that Maroney is not part of the Hollywood crowd.
"He's a great guy," the source said. "He's smart and funny and I think really keeps her on her toes and he doesn't treat her like a celebrity like the other boyfriends did."
The insider added, "He's definitely the coolest guy she's dated. [He's] not affected by Hollywood."
In June 2018, a source confirmed to PEOPLE that they were dating (according to Page Six TV, a close friend introduced the two) and they were pictured later that month on a romantic candlelit dinner in New York City.
Then the couple jetted off to Paris and Rome in August. At the time a source told PEOPLE the couple "seemed happy, occasionally holding hands" during their Parisian trip.