Pregnant Kate Middleton Opts for Water While Prince William Drinks Beer at St. Patrick's Day Parade

Kate Middleton takes a sip of water while attending the annual Irish Guards St Patrick’s Day Parade on Saturday (March 17) at the Cavalry Barracks in Hounslow, England.

The 36-year-old Duchess of Cambridge opted for water as she is pregnant with her third child, but her husband Prince William enjoyed a pint of Guinness during the celebration.

PHOTOS: Check out the latest pics of Kate Middleton

FYI: Kate is wearing a Catherine Walker green coat and Gina Foster hat.

30+ pictures inside of Kate Middleton and Prince William at the parade…