Casper, the mattress company that counts Hollywood A-listers including Leonardo DiCaprio among its investors, can now add royalty to its list of backers.

KBW Ventures, headed up by Prince Khaled bin Alwaleed AlSaud, recently invested in New York-based Casper, which has been aggressively advertising in Bahrain and the United Arab Emirates, the prince told The Post.

“We are also working with Casper to supply the beds on Emirates Airline,” Prince Khaled said.

The mattress in a box company’s Web site says that it currently ships to four European countries and Canada.

“We’re excited to explore expanding into the Middle East. There is demand for Casper across the world, and we’re eager to see what the future holds as we continue to grow as a global sleep brand,” a Casper spokeswoman said.

The prince was in Gotham to promote his investment in National Geographic Encounter: Ocean Odyssey, an interactive exhibit that opened in Times Square six months ago. His firm is building an Ocean Odyssey in Saudi Arabia.