Kaley Cuoco, The Big Bang Theory actress, is engaged to Ryan Sweeting, tennis player!  
Big Bang Theory Actress Kaley Cuoco recently was the girlfriend of Superman Henry Cavill, but is seems like she's moved on quickly - she and Ryan Sweeting have been together for only three months!
Big Bang Theory Actress Kaley Cuoco's rep commented on the quickness of the engagement to Ryan Sweeting, saying: "When you know, you know."
Of course, due to the short time of the relationship between Kaley Cuoco and Ryan Sweeting before getting engaged, it could pose a challenge for them in their relationship and marriage.

Watch Big Bang Theory Actress Kaley Cuoco Gets Engaged to Ryan Sweeting Video here: 
Website Psych Central discusses the 5 stages of intimacy that happen in a relationship.  In the first stage, infatuation, the difficult parts of a relationship don't really apply: "Oh, the sweet, syrupy stage of infatuation. It's so wonderful and so difficult to resist. Hormones and logic rarely coincide, so we find ourselves doing things like checking email 12-24 times an hour, not eating, going to get our nails done at midnight, buying pajamas to match our bedsheets...
"Infatuation makes your dopamine levels soar, producing a full-body euphoria that causes humans to seek out sex again and again. To wit, brain scan studies show that the brain during orgasm is 95 percent the same as the brain on heroin. Your brain cannot, biologically, maintain the high of infatuation: You will fry.
"The infatuation will ebb and flow at different points. The sex will not always be that good ... it may get better, or it may get worse. But all those lovely feelings of that first initial swim in the cool crisp pond of falling in love: How many movies could we watch about that? Billions. It's pure poetry. Love magnified; a revisit to the warm womb of security. Then, the negotiation between security and autonomy, that life-long struggle, crawls in and we begin to land."
Infatuation rarely lasts longer than a year, and it can cause people to overlook aspects of their relationship that might be difficult in the long term.  
Hopefully Big Bang Theory Actress Kaley Cuoco and Ryan Sweeting can overcome the difficulties presented by a short relationship before getting engaged!