More than a year after splitting from her husband following his affair with her best friend, Shania Twain took to her official site to tell fans she's doing great and to announce her new relationship.

On Friday night, the country singer's 44th birthday, she posted a personal letter and a 15-minute video travelogue of her most memorable moments from the past year.

(Last week, she promised fans she would be giving them a "small gift." It was the first time since her appearance at the Country Music Awards in November that Twain spoke publicly through a video on her site.)

Find out what other star has a birthday yesterday!

"I feel very alive and well, ready to take on the gift of another year," Twain writes. "When I wake up each day I remind myself how lucky I am to have all the beautiful things I do in my life and allow that gratitude to fuel me for the day, taking one day at a time. I try not to worry about tomorrow since I realize I can't control what it will bring or whether tomorrow will even come."

The star split from her husband, Robert "Mutt" Lange in May 2008 after he had an affair with her longtime best friend, Marie-Anne Thiebaud, who also managed the couple's chateau in Switzerland.

"I consider myself on a journey of discovery and recovery," she says of life post-split. "I don't accept to be held down by the past, nor do I expect too much of the future."

See photos of stars' ugliest splits.

Who is accompanying Twain on that journey?

Thiebaud's ex-husband, Frederic Thiebaud, whom Twain calls "a dear friend and true gentleman."

He "has been the most constant companion of support for both [8-year-old son] Eja and me, and having gone through the suffering of his family splitting apart at the same time under the same extreme circumstances, he understood me better than anyone," she writes. "We leaned on one another through the ups and downs, taking turns holding each other up. We've become stronger and closer through it all."

Since both their families were torn apart by their spouses' affair, Twain and Thiebaud -- whom a friend "affectionately" refers to as Lucy and Ricky Ricardo -- have been spotted vacationing with her family in Canada, New York City and Florida.

"When I reflect on it all, it's clear how remarkably active my life has been since last December -- a time in the life of someone working hard to 'move on' and succeeding," she writes.

The video on her site, which includes clips of her skydiving and riding camels, also shows her adventures with Fred. (In one clip, he gives her a surprise picnic on a glaciar in the Swiss alps.)

See photos of other celebrities doing amazing things.

She concludes, "Fred and I have certainly had a lot of laughs through the months."

Get more Us! Follow us on Twitter, Friend us on Facebook, Join Us Weekly's Celebrity Fantasy League, Subscribe to Us Weekly