Mila Kunis and Ashton Kutcher Dating (Photo : Flickr)

Rumors of stars Ashton Kutcher and Mila Kunis dating get stronger as they two were seen getting cozy during lunch on Saturday.

They definitely would make a cute couple. However, ex co-stars from That 70's Show, Ashton Kutcher and Mila Kunis continue to deny any rumors of them dating each other. In spite of this, the rumors refuse to die down and the incident that took place last Saturday only adds fuel to the fire.

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The stars were seen cuddling each other during a quiet lunch on Saturday afternoon.  The two were having lunch on the balcony of Boa restaurant in West Hollywood, Calif. This is not the first time they have been seen together sharing a meal. Last week, Kunis and Kutcher enjoyed a formal dinner at the Italian eatery Giorgio Baldi's in Santa Monica, Calif.

Rumors first started in April when Kunis and Kutcher enjoyed a private weekend getaway at Carpinteria, Calif (an ocean side town, south of Santa Barbara). Earlier this month, these rumors gained more traction when the two were seen enjoying a ride on Ashton's chopper in Hollywood. The Black Swan actress' car has also been spotted parked outside Kutcher's house overnight on many occasions.

"They have been close friends for years and there has always been a lot of chemistry," a friend of the couple, who did not want to be identified, told Celebuzz earlier this year. "Whenever they are in between relationships, or aren't seriously dating anyone, they tend to spend more time together."

However, the source also said that neither is ready for a serious romance. "But at the end of the day, they are great friends and have a lot of fun together," the insider added.

Previously Kutcher has been married to Demi Moore for six years. In November 2011, the actress filed for divorce after which Kutcher was linked with screenwriter Lorene Scafaria. Kunis was most recently linked to Home Alone actor Macaulay Culkin, whom she dated for 8 years.