CINNAMINSON — What began as a birthday and graduation party turned into an entirely different type of celebration for a 21-year-old girl with Down Syndrome.

As she sat at the table reading cards and opening gifts on June 25, Ashley Greenhalgh smiled excitedly with each package and envelope, but it was a special gift from her boyfriend Danny that led to tears of joy.

Inside a small, neatly-wrapped box was a promise ring that Danny — who was also born with Down Syndrome — got down on one knee to present to the excited Cinnaminson girl.

"Both Danny and Ashley were born with Down Syndrome; not only do they both share an unconditional love for one another, they show a genuine appreciation for life on a daily basis," Ashley's sister Courtney Greenhalgh wrote on a Facebook post that accompanied the video, which she hoped would go viral.

Since posting the video on June 25, it has been viewed more than 1.2 million times and shared more than 1,000 times.

"Danny and my sister have been dating for two years and couldn’t be more perfect for each other. They both have each other’s best interests at heart," Courtney wrote.

She says Danny and Ashley had previously talked about getting married sometime in the future, although they both knew that "the timing isn’t right just yet."

"Danny wanted to go out of his way to let my sister know that he will always be there for her and that he only has eyes for her," Courtney said, adding that Danny worked and saved up his own money to buy Ashley the diamond promise ring. "The presentation of the ring takes this thoughtful gift to a whole new level."

According to NBC 10 Philadelphia, Danny and Ashley met at Kingsway Learning Center in Moorestown.

Toniann Antonelli is a social content producer for NJ 101.5. She can be reached at toniann.antonelli@townsquaremedia.com, or on Twitter @ToniRadio1015.