If you want to take your sweetie to a rom-com this Valentine's Day weekend, but you're just not into He's Just Not That Into You, consider THE 13TH OF PARIS. Horizon Theatre's Lisa Adler directs Mat Smart's romantic comedy, which depicts a young man who travels to his late grandparents' apartment in the 13th Arrondissement of Paris carrying a suitcase of their love letters. The cast includes such esteemed actors as Robin Bloodworth, Mark Kincaid and Carolyn Cook, who starred in Horizon's utterly charming Parisian holiday, Madame Melville, a few seasons ago. Expect a high quotient of ooh-la-la for Horizon's 25th season. Through March 15. $20-$30. Wed.-Fri., 8 p.m.; Sat., 8:30 p.m.; Sun., 5 p.m. Horizon Theatre, 1083 Austin Ave. 404-584-7450. www.horizontheatre.com.