March 17, 2016 03:10 PM

Reese Witherspoon has never seemed happier.

One reason for her joy? She’ll be celebrating the fifth anniversary of her happy marriage to husband Jim Toth on March 26.

“Since marrying Jim, Reese is transformed,” a source close to the actress who turns 40 next Tuesday tells PEOPLE in this week’s issue. “Even now, she often gets giddy when she talks about him. They very much complement each other.”

For more on Witherspoon and Toth’s marriage, as well as information about her upcoming 40th birthday celebration and a timeline of her work (and beauty!) over the years, pick up this week’s issue of PEOPLE on newsstands Friday.

The source also adds that Toth, 45, is a great dad to the couple’s 3-year-old son, Tennessee, and her two children with ex-husband Ryan Phillippe, 16-year-old Ava and 12-year-old Deacon.

“Jim is a great dad, stepdad and husband,” says the source. “He is her rock.”

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