Check out snaps from their romantic night in the gallery below and click inside for even more...
Haynes, who is also known for his role on "Arrow", first confirmed that he and Leatham were dating three weeks ago, once again through a post on Instagram. The former "Teen Wolf" star 'said yes, ' when his boyfriend of just a few months, Jeff Leatham, proposed while they were on an exotic vacation together.
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".
"Thank you @Cher for the handsome "I got you babe" proposal lead in, you sounded incredible as always The most special night of my life", Haynes beamed on Instagram. "So Appreciative and much love", he captioned the video clip he played for his fiancé. "HE SAID YES!", he captioned the photo, along with the hashtag #FireworksFlowersCher.
"Jeff I'm crying. You're the sweetest person in the world".
The pair, who are now on a tropical vacation, were confirmed as an official couple back in February.
Less than a week before their engagement, Colton was gushing about Jeff on social media. Tell us what you think below.