He is growing up fast ladies! On Thursday, May 13, Robert Pattinson will celebrate his 24th birthday!

While presumably spending some quality time with his beau, Kristen Stewart, RPatz will have to shelve the romance for a few hours as he gears up for his appearance on "The Oprah Winfrey Show" the day of his birthday. 

RPatz and KStew are currently both in California working on separate projects. 

Pattinson is getting ready to start filming his new movie "Water on Elephants" while Stewart is working on something that is being kept under the radar. 

The pair are gearing up for the release of the newest "Twilight" installment. 

On Thursday, RPatz will join his girlfriend (although it's not official- maybe Oprah will get it out of them), KStew and co-stars Taylor Lautner and Dakota Fanning on the show to promote their latest "Twilight" movie. 

Preparations are underway for the big opening of "Twilight Saga; Eclipse" on June 30. 

Remember back a few weeks ago when it was KStew's birthday?

She flew to Budapest to be with her lover so she could celebrate in his arms. 

We are sure this birthday will be just as romantic for RPatz. 

Kristen Stewart and Robert Pattinson