The 28-year-old former Arrow actor is engaged to boyfriend Jeff Leatham, he revealed on Sunday. Haynes Instagrammed a picture of the two kissing in front of an impressive fireworks display, writing, "I SAID YES!!!," and adding a ring emoji.
Haynes' rep tells ET that Leatham proposed at Las Ventanas al Paraiso in Cabo San Lucas, Mexico, and started with a personalized video message from Cher singing their favorite song, "I Got You Babe," followed by video messages from their family members and close friends, including Melanie Griffith and Serena Williams. After Colton said yes, the proposal continued with a fireworks display set to Bruno Mars' "Marry You" as the couple danced in tears.
"I'm so blessed and happy for the future and my life together with Jeff," Haynes says in a statement.
BEVERLY HILLS, CA - DECEMBER 04: Actor Colton Haynes arrives at the 2015 March Of Dimes Celebration Of Babies at the Beverly Wilshire Four Seasons Hotel on December 4, 2015 in Beverly Hills, California. (Photo by Jon Kopaloff/FilmMagic)
BEVERLY HILLS, CA - NOVEMBER 18: Athlete Serena Williams (L) and actor Colton Haynes attend Louis XIII Celebration of '100 Years' The Movie You Will Never See, starring John Malkovich at a private residence on November 18, 2015 in Beverly Hills, California. (Photo by Donato Sardella/Getty Images for Louis XIII)
NEW YORK, NY - NOVEMBER 03: Actor Colton Haynes is seen in Midtown on November 3, 2015 in New York City. (Photo by Michael Stewart/GC Images)
WEST HOLLYWOOD, CA - SEPTEMBER 24: Actor Colton Haynes attends Men's Fitness Magazine Hosts Annual 'Game Changers' Celebration at Palihouse on September 24, 2015 in West Hollywood, California. (Photo by Allen Berezovsky/WireImage)
NEW YORK, NY - SEPTEMBER 11: Colton Haynes attends day twelve of the 2015 US Open at USTA Billie Jean King National Tennis Center on September 11, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Jean Catuffe/GC Images)
NEW YORK, NY - SEPTEMBER 11: Actor Colton Haynes attends the Polo Ralph LaurenÂ fashion show during Spring 2016 New York Fashion Week at Gallow Green at the McKittrick Hotel on September 11, 2015 in New York City. (Photo by Michael Loccisano/Getty Images)
NEW YORK, NY - JULY 15: Actor Colton Haynes wearing clothing designed by Billy Reid poses backstage at Billy Reid - New York Fashion Week: Men's S/S 2016at Art Beam on July 15, 2015 in New York City. (Photo by Astrid Stawiarz/Getty Images For Billy Reid)
NEW YORK, NY - JULY 15: Actor Colton Haynes poses for a photo backstage at the Richard Chai fashion show during New York Fashion Week: Men's S/S 2016 at Skylight Clarkson Sq on July 15, 2015 in New York City. (Photo by Cindy Ord/Getty Images)
HOLLYWOOD, CA - MAY 26: Actor Colton Haynes arrives at the premiere of Warner Bros. Pictures 'San Andreas' at TCL Chinese Theatre on May 26, 2015 in Hollywood, California. (Photo by Barry King/FilmMagic)
HOLLYWOOD, CA - MARCH 14: Actor Colton Haynes arrives at The Paley Center For Media's 32nd Annual PALEYFEST LA - 'Arrow' And 'The Flash' at Dolby Theatre on March 14, 2015 in Hollywood, California. (Photo by Jon Kopaloff/FilmMagic)
WEST HOLLYWOOD, CA - FEBRUARY 22: Colton Haynes attends the Elton John AIDS Foundation's 23rd annual Academy Awards Viewing Party at The City of West Hollywood Park on February 22, 2015 in West Hollywood, California. (Photo by Karwai Tang/WireImage)
LOS ANGELES, CA - JANUARY 08: Actor Colton Haynes attends Audi celebrates Golden Globes Week 2015 at Cecconi's Restaurant on January 8, 2015 in Los Angeles, California. (Photo by Charley Gallay/Getty Images for Audi)
LAS VEGAS, NV - SEPTEMBER 19: Colton Haynes attends the iHeart Radio Music Festival - press room held at MGM Grand Resort and Casino on September 19, 2014 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)
NEW YORK, NY - SEPTEMBER 08: Colton Haynes attends Ovadia & Sons fashion show during Mercedes-Benz Fashion Week Spring 2015 at Pier 59 on September 8, 2014 in New York City. (Photo by Ilya S. Savenok/Getty Images)
NEW YORK, NY - SEPTEMBER 07: Colton Haynes attends the Moet & Chandon Suite at The 2014 US Open during the Women's Final at USTA Billie Jean King National Tennis Center on September 7, 2014 in New York City. (Photo by Joe Scarnici/Getty Images for Moet & Chandon)
SAN DIEGO, CA - JULY 25: Actors Stephen Amell (L) and Colton Haynes attend the 'Arrow' panel on July 25, 2014 in San Diego, California. (Photo by Chelsea Lauren/WireImage)
BEVERLY HILLS, CA - JUNE 19: Actor Colton Haynes arrives at the 4th Annual Critics' Choice Television Awards at The Beverly Hilton Hotel on June 19, 2014 in Beverly Hills, California. (Photo by Jon Kopaloff/FilmMagic)
Discover More Like This
BACK TO SLIDE
"I have known Jeff forever, and he is just amazing, and I think they are going to be really happy and I am excited for them," Cher told ET.
Addressing Leatham directly, she added, "I got you babe -- alright this is for you, you know what it is -- you know what you're supposed to do now. And this is going to be the best thing ever, and you have to call me to tell me how it worked out, alright?"
"It's not every day that someone comes into your life & makes you want to be a better man," the Arrow alum wrote next to a picture of the two snuggling in bed on Instagram. "I feel so blessed to be by your side @jeffleatham. #WhatMoviesAreMadeOf."
The two first ignited dating rumors after Haynes shared a sunset pic of the couple embracing in the center of a heart made of rose petals on Valentine's Day.