A younger woman. A Vegas wedding. A new tattoo. Kelsey Grammer may have all the fixings for a mid-life crisis.

RadarOnline.com is reporting that the 57-year-old actor is going through some changes in his middle age and might not be coping with them so well. 

Grammer, of Frasier fame, left his Real Housewives of Beverly Hills wife, Camille, for Kayte Walsh, a 31-year-old flight attendant. Kayte, his fourth wife, is currently pregnant with twins and the couple renewed their vows in Las Vegas over the weekend after just 16 months of marriage.

The sporadic ceremony took place at the Little Church of the West in Las Vegas, inspired by Anne Margaret and Elvis Presley in Viva Las Vegas, according to Us Weekly.

In April, Grammer got his first tattoo - the name Katye on his hip in blue ink - at a tattoo parlor in Chicago while filming the Starz series Boss. It cost his $60, the New York Post reported.

So, what is with the 57-year-old's unusual behavior?  

I seriously think Kelsey is going through a mid-life crisis, the source tells RadarOnline.com. He has married a woman who is twenty-five years younger than him, he recently got his first tattoo, of her name, he decides to renew his wedding vows after being married for a little over a year? This behavior is far away from the Kelsey that I have known for years, it's like he is reliving his youth. He used to be such a private person.

What's next, is he going to pierce his ears and get a mohawk? He will be collecting Social Security when the twins are in elementary school. Yet, Kayte and Kelsey want to have even more children after the twins are born!

It's completely bizarre that Kelsey and Kayte would renew their vows after only being married for a year. Kayte is very pregnant and it was Kelsey's idea to go to Las Vegas to renew their vows. With this and the tattoo incident, it's as if he is constantly trying to prove to the world and to Kayte how much he loves her and it's sad to witness, a source previously told RadarOnline.com.

His strange behavior had the blogosphere talking.

We don't really blame him...though, we DO think he should just accept the fact he's not 30 anymore and just go with the whole older and wiser outlook! quipped celebrity gossip blogger, Perez Hilton. And somewhere in the 90210, Camille Grammer is laughing with that seksi Greek god boyfriend of hers!

Kelsey Grammer met Kayte Walsh in December 2009 on a flight to England, a full six months before he publicly announced plans to divorce Camille, with whom he has two children, according to the NY Post.

We actually met in the air on a plane to England, Grammer told late-night television host Jimmy Kimmel in January. It was very romantic, she was working on the plane. We went out for coffee several days later and had this magical night in the snow in London around Christmas time. It was two years ago.

The couple married in February 2011. The twins are expected in July.

I'm really looking forward to meeting these new arrivals, the actor told Yahoo! News. Fatherhood's always different, based upon the character that comes into your life. They arrive and tell you what you have to do, he continued. [Kayte is] extraordinary. She's one of the most loving, amazing, warm human beings I've ever met. She's funny and serious all at the same time. She's an amazing person and I think she'll blow [the kids] away.

Camille was blown away by her husband's infidelity.

Kelsey...Kelsey got another woman pregnant when we were still married, she told E! News in January 2011. She continued, If I had known that Kelsey and I were separating, and this was gonna happen, there's no way I would've shot the show. What can you do? I mean, it was a good diversion while going through this, because it kept me busy, so that's a positive. The two officially divorced before Grammer re-married.

Camille is currently dating 35-year-old bankruptcy lawyer, Dimitri Charalambopoulos.

He's tall, 6'2', dark, handsome, she told E! at a Halloween party in Santa Monica to benefit the Children Affected by AIDS Foundation last October. He loves to cook. I call him my Greek god. A year ago I would have said I definitely never, I will never enter into that kind of agreement. But now I've definitely changed my mind.