Kendall Jenner celebrated her 18th birthday with family and friends over the weekend. The young reality star legally became an adult on Nov. 3 and already has started getting offers from porn companies to star in her very own sex tape, TMZ reports.

Reportedly at least six X-rated companies wanted to wish Jenner a happy birthday by offering her millions of dollars to film a sex tape. One of the companies interested in Jenner is Bangyoulater.com and is reportedly offering the barely-legal adult $1.8 million to film a porno with a partner of her choosing.

Other companies throwing big bucks at the reality star are Brazzers, Babes and Digital Playground. According to TMZ, Digital Playground even offered her the option of doing a girl-on-girl encounter with porn star Jesse Jane.

Even though Jenner's sister Kim Kardashian rose to fame after her sex tape with Ray J was sold to Vivid Entertainment, the new mom barely acknowledges her past. Kris Jenner turned the 2007 tape into a cash-cow for the family but Kardashian now tries to distance herself as much as possible from that.

Jenner celebrated her birthday with her family and friends at six Flags Magic Mountain followed by a birthday dinner.

"Happy 18th birthday to the sweetest girl I know @kendalljenner I hope your adult years are filled with happiness & so much [love]," Kim Kardashian tweeted.

"Happy birthday Kendall!! 18 Years ago my life was changed forever because of you! The joy and peace you bring to so many lives are just a few of the rare gifts your spirit possess. I couldn't be prouder of the woman you are becoming. Happy birthday to my best friend, my roommate, my puppy sister, my heart. Sisters by blood, best friends by choice," Khloe Kardashian wrote.

According to Radar Online, Jenner had more than one reason to celebrate turning 18. On her birthday the reality star gained access to a privately-held trust account worth more than $300,000. In the state of California, child stars have to place 15 percent of their earnings in a trust, known as Coogan's Trust.

Parents of the child stars don't have access to the trust and the star themselves cannot access the money until they legally become an adult.