Prince Harry, Meghan Markle Wedding Bells Ring ... Sort Of

3/4/2017 7:02 AM PST

Prince Harry continues to show the world he's super serious with GF Meghan Markle ... because you don't take casual dates to a Caribbean wedding.

Harry and Meghan attended the wedding of Harry's good pal, Tom Inskip in Montego Bay.

They were overtly affectionate ... she swam, he smoked.

Be real -- if you could be William or Harry ...