Kim and Khloe Kardashian vacationed with their family on the Greek island of Mykonos filming their E! reality show Keeping Up with the Kardashians, but the sisters were miserable as they were forced to go on their family vacation without their significant others.

Although Kim's boyfriend, Kanye West, and Khloe's husband, Lamar Odom, were invited to go on the trip, both claimed had been busy with other obligations.

“They were contractually obligated to go but they’re miserable,” a source said of the sisters to Radar Online. "Kanye politely declined the invitation, citing work. Lamar, would have gone but he is currently in the NBA playoffs with the Los Angeles Clippers."

Khloe wanted to go to Memphis, Tenn. to be with her husband during his game, and the insider said, “This is the most important time of the year for Lamar, and she wanted to be there to support him."

Kim is also upset that her reality series is keeping her away from her boyfriend, whom she is expecting a child with this summer.

"Kim wasn't surprised that Kanye declined to join the family in Greece, she is really frustrated that her life is controlled by the reality show commitments," the source said.

The family always takes a vacation to be featured on Keeping Up with the Kardashians, and the trip to Greece was paid for by Ryan Seacrest‘s production company, according to the website.

Tags: Kim Kardashian Keeping Up With The Kardashians Ryan Seacrest