Which Celebrities Are Single, Engaged and Expecting in 2011?

Jan. 3, 2011— -- It's a new year -- and for many celebrities, already the masters of reinvention, that means a new life.

Last year ended with a flurry of engagements, surprising splits and pregnancy shockers. Too many to keep up with? Not to worry. Here's your celebrity status primer for 2011.

Who's Single?

John Mellencamp

Heartland rockerJohn Mellencamp was the last celebrity of 2010 to announce his divorce.

On Dec. 30, the 59-year-old singer of "Jack and Diane" and "Hurts So Good" revealed that he and his wife of 18 years, model Elaine Mellencamp (nee Irwin), were splitting up.

"John and Elaine Mellencamp are proud of their 20 years together and are very happy with their accomplishments both as parents and as a family. They will continue to raise their two children in Indiana but have decided to call it a day as a couple," their spokesman said in a statement last Thursday.

Now, the New York Post is reporting that Mellencamp may be seeking comfort from new friend Meg Ryan. The singer and actress have been spotted at Mellencamp's recent concerts.

According to the Post's gossip column, the pair was seen walking arm-in-arm in New York last October, and Ryan has shown up backstage at several Mellencamp concerts on his most recent tour.

Perhaps Ryan is providing counsel to Mellencamp, having gone through her own public split from husband Dennis Quaid in 2001.

Or maybe it's just business. Mellencamp has been working on a musical, "Ghost Brothers of Darkling County," which stars Ryan.

Scarlett Johansson and Ryan Reynolds

In December, one of Hollywood's sexiest couples, Scarlett Johansson and Ryan Reynolds, called it quits.

"After long and careful consideration on both our parts, we've decided to end our marriage," the couple said in a statement released by Reynolds' publicist. "We entered our relationship with love, and it's with love and kindness we leave it. While privacy isn't expected, it's certainly appreciated."

Johansson, 26, started dating Reynolds, 34, in 2007. The couple announced their engagement in May 2008 and married that September in Vancouver, British Columbia.

Zac Efron and Vanessa Hudgens

Four years after meeting on the set of "High School Musical," young golden couple Zac Efron and Vanessa Hudgens ended their relationship.

Efron, 23, had recently spoken about his love for 22-year-old Hudgens, saying it was "exactly how it should be. It's real."

Michael C. Hall and Jennifer Carpenter

Michael C. Hall and his wife, Jennifer Carpenter, who met on the set of the cable series "Dexter," where they played brother and sister, announced in December that their two-year marriage was over, "having been separated for some time."

Liz Hurley

Also in December, Liz Hurley announced that she had separated months before from husband Arun Nayar after a U.K. tabloid published a picture of the 45-year-old actress-model kissing Australian cricket player Shane Warne.

"Not a great day," Hurley wrote on her Twitter page. "For the record, my husband Arun & I separated a few months ago. Our close family & friends were aware of this."

Eva Longoria

In her short three-year marriage to basketball star Tony Parker, "Desperate Housewives" star Eva Longoria battled rumors of infidelity.

Perhaps it all became too much. In November, the couple filed for divorce in Los Angeles Superior Court, citing "irreconcilable differences."

Charlie Sheen

It didn't come as much of a surprise when Charlie Sheen announced his divorce from second wife Brooke Mueller in November.