The end of a generation is upon us. One Tree Hill will air its ninth and final season beginning Jan. 11 on the CW, and the network threw a party to celebrate! 

Sophia Bush, along with creator Mark Schwahn and some of her "wonderful" co-stars, including Lee Norris, Robert Buckley, Jackson Brundage, Tyler Hilton, Bethany Joy Galeotti, Stephen Colletti, Shantel VanSanten and Paul Johansson, stepped out at CW's presentation of "An Evening with One Tree Hill" last night at the ArcLight Theater in Los Angeles, Calif., to celebrate the amazing success of their hit show. 

OK! NEWS: SOPHIA BUSH TALKS JUSTIN BIEBER AND CHARITY TO OK!: "HE'S DOING A GREAT THING!" 

“What a night. #OTHinLA (pic) I am so grateful for my castmates, who are wonderful friends, my family really. We have taken an incredible journey together. #PaulJoyTylerMark ShantelRobJacksonStephenLee (yeah that’s in our seated order ;),” Sophia wrote on her WhoSay page.

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Notably missing from the group was James Lafferty, Jana Kramer and Austin Nichols, as well as OTH alumni Chad Michael Murray and Hilary Burton

Are you ready for the final season, Tree Hill fans? 

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