The Unbreakable star took to her Instagram account to share photos from the party, which featured a nautical theme.
"So, yesterday was a special day for our family," Bea wrote in her post. "I threw a baby shower for my sister, Thalia. It was a beautiful celebration. Our family, friends and loved ones just all wanted to shower this future mama with all the love that she deserves! Congratulations, James and Thalia! Your journey as parents will soon begin, and I know you two will do a very good job raising my nephew. We are all very excited!"
Thalia is engaged to Bea's younger brother, James. They are expecting a baby boy, who is due to arrive in October.