By becoming your pet chicken

You take Selena back to your house, and into the backyard.

"Selena, strip naked," you order.

Selena obeyed, stripping out of her sexy dress and standing completely naked in front of you.

"Selena, when I wake you up, you will become my pet...chicken. Yes, you will become a horny chicken in heat. All your memories of being Selena Gomez will be buried deep in your subconscious where you can't get them back. Answer me as a chicken would if you understand."

"Bwak." Selena said.

"Oh, and one more thing," you took her phone and used her face to unlock it.

"Gonna use this to contact some of your friends," you said. Then you woke Selena up.

"Bawwk!" Selena clucked as a chicken, tucking her arms into her armpits. "Buk-buk-buGAWK!"

You stroke the former pop star's hair and let her run around the yard which would serve as her new home forever now. You had more celebrities to collect.