Tom Holland is planning to spend his weekend watching girlfriend Zendaya’s sexually-charged love triangle drama. The ‘Spider-Man’ actor, 27, is said to have been dating the ‘Dune’ star, also 27, since 2016, and has now helped her promoted her new film ‘Challengers’ – which sees her tennis star character Tashi Duncan thrust into the centre of a three-way romance with her two on-screen love interests, played by Mike Faist, 32, and 33-year-old Josh O’Connor. Tom shared a snap of the poster for the steamy movie on his Instagram, which he captioned: “I know what I’m doing this weekend!” He also gav…