Stefan comes back to town in this installment of The Vampire Diaries and discovers a change in Elena.

Elena is being a great hostess at her swimming hole bash, ensuring all guests are refreshed and hydrated.

Elena plans on introducing Caroline and Liam at the swimming hole. How will that go over?

Jeremy and Caroline chat by the swimming hole during their big, fun day.

Caroline and Elena get a little time to themselves during the swimming hole festivities.

Sarah (Gabrielle Walsh) gets a nice feel of Jeremey's toned body while carousing at the watering hole.

Jeremy is hardly Elena's little brother anymore, is he? Dayum. Nice beach bod, Jere!

Elena is nice and tan for a vampire, isn't she? Looks like she and Jeremy should change places!

Is Stefan expressing his concern to Caroline about Elena's behavior?

Caroline looks worried during her discussion with Stefan in the woods by the swimming hole.

Stefan walks away from Caroline and I can't help but think she's never looked as lonely as she does right now.

Elena and Jeremy share some fun at the watering hole in this scene from The Vampire Diaries Season 6 Episode 3, "Welcome to Paradise."