Card Request for Woman Who Celebrated 18th Birthday Alone Goes Viral Hallee Sorensen should have a much happier day this year.

 -- The good deed of an autistic woman's cousin has captured the heart of the internet, and it looks like the U.S. Postal Service will have its work cut out for it soon.

Rebecca Prefontaine was heartbroken when her cousin Hallee Sorenson had to celebrate her 18th birthday alone last year. Hallee has autism, and although she sent out invitations to classmates and friends to join her for a bowling party, no one showed up.

"She was sitting there, eating her birthday cake, by herself and it was heartbreaking," Prefontaine told ABC News' Massachusetts affiliate WGGB.

So Prefontaine, who goes by Rebecca Lyn on Facebook, put out a simple message in the hopes that she could make Hallee's 19th birthday a much better memory.

"I would love to flood her mailbox with birthday cards, from all over! Hal loves getting mail- this would be the best birthday gift she could ask for," the post read. "If you could find it in your heart to take a few mins out of your day and send her a card, I would be forever greatful [sic]. This would mean a lot to her mother as well, for as you can imagine, watching your child cry into her birthday cake breaks your heart. If there is anyone who deserves a great birthday, this is the girl. Feel free to share this post!"

Since then, the post has been shared almost 150,000 times.

"My cousin is a beautiful young woman who will always have the mind of a child," she wrote. "So as you can imagine, she was heartbroken and beyond sad."

So many people wanted to send gifts in addition to cards that Prefontaine had to add a note to her original post saying that wasn't necessary.

She told WGGB she's "been so moved by the outpouring of support."

Hallee's birthday is in July. Cards can be sent to:

Hallee Sorenson

34 Wellesley Way

Bangor, ME 04401