"Philly’s home to the Liberty Bell, and tmrw it’s gonna be home to my EarthDay Twitter Challenge! Keep your eyes on my tweets! #EllenInPhilly."
Ellen revealed Wednesday afternoon exactly where to meet and when:
"Head to the grassy area in front of Independence Hall @ 4:30."
"If you’re not in front of Independence Hall, you can’t be in the running for an amazing prize," she added.
The prize -- 50 free bikes worth $500 each.
Wednesday morning Ellen issued the challenge telling followers what to do:
“Philly: In honor of Earth Day, make (& wear) an outfit made out of recycled materials. Be fun & creative -- I’ll tell ya where to be later.”
"Your outfit can be made out of anything. It’s like Project Runway meets Earth Day. Can’t wait to see Philly represent..." DeGeneres added.
A little after 4 p.m. it was getting crazy as creative people started showing up, Ellen Tweeted.
People checked back throughout Wednesday to find out more about #EllenInPhilly.
Fan, follow and download: Get the latest from NBCPhiladelphia.com anytime, anywhere. Also get breaking news delivered right to your mobile phone -- just text PHIBREAKING to 639710 to sign up.