Riviera romance

KIRSTEN Dunst (above) and fiancé Jesse Plemons were spotted on Sunday catching a flight from LA to the Cannes Film Festival — and upon arrival, didn’t waste any time getting romantic on the Riviera. A spy said the couple and “Fargo” co-stars were cozy among a power crowd at Cannes favorite Le Maschou on Monday. “Kirsten and her fiancé were making out,” a fellow diner told us. Dunst’s at Cannes for her Sofia Coppola film, “The Beguiled.” Plemons was seen schlepping his guitar to Cannes.