Jenny also wore a whimsical flower crown to marry Forrest at the fictional wedding.
One Twitter user wrote: “Her outfit reminds me very much of Forrest Gump’s wife (and I don’t mean that in a nasty way).
“The other photo Carrie is barefoot too, like Jenny. Maybe it’s her favourite film too.”
One wrote: “Now, I ain’t being nasty, but on first viewing is Carrie’s dress the one worn by Jenny in Forest Gump? #BorisAndCarrie.”
One called the look “Forrest Gump cosplay” noting the “heavy floral crown, 70s style dress, bare feet.”
