Irina stood out like she normally does, but even more so thanks to a sexy lime green swimsuit accentuating her figure ... as she hopped off the boat and took a dip in the sea. Wonder if she was inspired by Rita Ora?
We're told Irina and her family had yachts of fun for a few hours before heading back to land and calling it a day.
As we've reported ... Shayk and Cooper agreed last month to share custody of their daughter and live in the same city. Looks like Bradley's might have to step up his vacay game when it's his time with Lea.