Credit: Instagram

While we were busy celebrating Shay Mitchell's (Emily) birthday with a best fashion moments gallery of her yesterday, it looks like she was ringing in the big 2-6 in a different way.

Shay took to Twitter
yesterday (April 10), showing off a larger than life, floor-to-ceiling balloon bouquet. She wrote, "This is what a 100+ balloons looks like. I've had a Xmas tree before but never a balloon tree... Big surprise."

As for who sent Shay such a fun package? In true Rosewood fashion, Shay kept it a secret on the Twitterverse. It could be from her family, or a PLL castmate, but we're also wondering if Glee star Jacob Artist might have sent the gift. After all, the two have been spotted hanging out recently. Then again, it could just be from Shay's BFFs, so it will remain a mystery!

Pretty Little Liars
Season 4 premieres on Tuesday, June 11, 2013 at 8 p.m. ET/PT on ABC Family

Credit: Shay Mitchell's Twitter Photo: Shay Mitchell's Balloon Bouquet