It's on TV so it would be rated 15+ in movies more like PG-13.
Gossip Girl - 2007 The Return of the Ring 5-24 is rated/received certificates of: USA:TV-14
Gossip Girl - 2007 The Princesses and the Frog 4-20 is rated/received certificates of: USA:TV-14
Gossip Girl - 2007 The Fasting and the Furious 5-5 is rated/received certificates of: USA:TV-14
Gossip Girl - 2007 War at the Roses 4-7 is rated/received certificates of: USA:TV-14
Gossip Girl - 2007 Enough About Eve 3-6 is rated/received certificates of: USA:TV-14
It is not rated.
Gossip Girl - 2007 The Goodbye Gossip Girl 2-25 is rated/received certificates of: Netherlands:6 USA:TV-14
Gossip Girl - 2007 The Townie 4-11 is rated/received certificates of: USA:TV-14
Gossip Girl - 2007 The Revengers 6-9 is rated/received certificates of: USA:TV-14
Gossip Girl - 2007 The Fugitives 5-23 is rated/received certificates of: USA:TV-14
Gossip Girl - 2007 The Debarted 3-12 is rated/received certificates of: USA:TV-14
Gossip Girl - 2007 Gaslit 4-10 is rated/received certificates of: USA:TV-14
Gossip Girl - 2007 It-Girl Happened One Night 4-15 is rated/received certificates of: USA:TV-14
Gossip Girl - 2007 Shattered Bass 4-21 is rated/received certificates of: USA:TV-14
Gossip Girl - 2007 Pilot 1-1 is rated/received certificates of: Netherlands:12 USA:TV-14
Gossip Girl - 2007 Con-Heir 5-18 is rated/received certificates of: USA:TV-14
Gossip Girl - 2007 The Lady Vanished 3-14 is rated/received certificates of: USA:TV-14