He wrote to the presenter's talent booker, Amy Sugarman, asking for a five-week slot working for his radio show, and told her, 'I'm trying to change my image and make myself more likable.'
He then called into Seacrest's KIIS-FM radio show on Thursday and explained, 'How do you go from being hated to even a little bit likable? It's about who you're around.
'I've learned you need to be around likable people to even start to be likable. Who's the most likable person in America, if not the world? That would be Ryan Seacrest.'
And the 27-year-old former Hills star insisted that he is ready to turn over a new leaf.
'I got a nice nine-month vacation living on the beach collecting sand dollars, and I really got to reflect and realise that in entertainment, you can definitely go too far. I'm ready to start a whole new chapter.'
And with wife Heidi Montag off filming a new reality show for VH1, he said that he needs to find something to occupy his time.
'She's up every morning at like 4:30. She starts her day with jump-roping while I'm still asleep, and then she heads off to film this new series for VH1 and she doesn't get back until at least 10 pm,' Pratt said. 'I'm twiddling my thumbs all day like, 'I need to get a job'.'