Rihanna made a surprise appearance at Cannes Film Festival, walking the red carpet at the Palais to support her partner A$AP Rocky at the premiere of “Highest 2 Lowest.” After Spike Lee’s latest joint debuted to a 5.5-minute standing ovation, Rihanna and Rocky posed for photos in the rain as the singer’s 2016 hit “Work” played.

The singer and businesswoman wore a sky-blue Alaïa dress to accompany Rocky, who stars alongside Denzel Washington in “Highest 2 Lowest.” Rihanna is pregnant with her and Rocky’s third child, which she revealed at the Met Gala earlier in May. The two are already parents to two sons: RZA, 3, and Riot, 20 months.

In Variety‘s Cannes cover story, Rocky discussed being in a power couple with Rihanna, who recently released a new song for the upcoming “Smurfs” movie in which she’s playing Smurfette. “We both got movies coming out the same year,...