Taylor Swift wanted to be in 'The Lorax' because she loved Dr. Seuss as a kid.

Taylor plays Audrey in the animated 3-D film adaptation of Dr. Seuss' children's tale of environmental conservation, and she reveals she ''immediately'' agreed to take part because she was such a fan.

The singer said: ''It was an immediate 'yes' for me as soon as I heard it was Dr Seuss. It goes back to the original core of why I wanted to write music and tell stories.''

The film comes from the creators of 'Despicable Me' and follows 12-year-old Ted while he searches for a real Truffula Tree for Audrey. He must learn the story of the Lorax from the bitter hermit known as the Once-ler.

Taylor will be co-starring alongside Zac Efron (Ted), Danny Devito (Lorax), and Ed Helms (the Once-ler), but she admits she didn't see much of the star-studded cast while making the film.

She told Collider.com: ''I thought people were around each other but mine was completely alone. So I was imagining it in my head what the characters sound like and their responses.''