Mike Vrabel and a pregnant Dianna Russini were caught on video during their private boat trip nearly five years ago. Footage of the pair’s excursion, which was obtained by TMZ Sports Thursday, showed the New England Patriots head coach and the sports reporter walking together on the dock of a private boat rental company in Putnam County, Tennessee, in June 2021. The then-Tennessee Titans coach, clad in a dark T-shirt and blue swim shorts, trailed behind Russini in the surprising footage. Mike Vrabel and Dianna Russini (pictured here in June 2021) were caught on video during their private boat trip in Tennessee nearly five years ago. TMZ SPORTS TMZ Sports obtained footage of the New England Patriots head and the NFL insider during a lake outing in June 2021. TMZ SPORTS Russini, who was also dressed casually in an oversized graphic T-shirt and green shorts, appeared visibly pregnant in the clip.…