Yeah, of course.

From Create Your Own Story

Victorie still looks confused, but she doesn't question you. And neither do the other Career tributes. It seems like you might have an alliance! Sure, you lied to get it, but you have an alliance!

The District 2 boy, a handsome guy named Devin, says, "If you're in the Careers, you'll need to know the strategy. We're going to shelter in the Cornicopia, and create a big pile of supplies, m'kay? We'll takes turns guarding them. "Victorie, Luke, Sadie, me, Marie, Jack, and..." He stops when he gets to your name.

"Celeste," you finish, smiling. You're in the Careers!

Since you already have an alliance, the only choice is to Begin the Games.