VIDEO : Chris Pratt & Katherine Schwarzenegger Are Instagram Official

Actor Chris Pratt, 39, and author Katherine Schwarzenegger, 29, are going public with their relationship!
According to Extra, on Thursday, Pratt posted a birthday tribute to Katherine on Instagram.
?Happy Birthday Chief! Your smile lights up the room. I?ve cherished our time together. Thrilled God put you in my life.
Chris Pratt on Instagram
In response to the sweet post, Katherine said, ?I love you,? and included three heart emojis.
The pair seem to have gotten serious over the past few months!