Ashton Kutcher and Mila Kunis not preparing to walk down the aisle.

The former "That 70's Show" co-stars turned lovers have sparked engagement rumors after Kunis was spotted wearing a gold band on her ring finger (See Ring) while holding a bundle of flowers in Los Angeles on Wednesday

"They are not engaged," a source for the couple insisted. 

According to People Magazine, a source said Kutcher, 35, talked about popping the question to Kunis around her 30th birthday on Aug. 14.

"He knows what they have is amazing and special," said the source, who's in the actor's inner circle. "He's been thinking about proposing for a long time." 

The two were first rumored to be dating in April of last year and have stayed as mum as possible about the status of their relationship.

"They plan to get engaged soon. Being with Mila brought Ashton back to who he really is," a source told Us Weekly.

According to Us Weekly, the couple appear to be as tight as ever in recent months. The couple spent time in London with Kutcher's parents in May, as well as, vacationing with Princess Beatrice and her boyfriend Dave Clark in Saint Tropez, France the month after. 

Before Kutcher can become a husband again, he will need to finalize his divorce from actress Demi Moore. He filed from his 50-year-old wife in December 2012 after six years of marriage.

"When Ashton first became a single man via separation, he was eager to date around," another Kutcher source told People. "But that has changed since his relationship with Mila has grown and strengthened. His long-term friendship with her became a real romance, and he is very happy."