updated 02/28/2014 AT 1:25 PM ET
•originally published 02/28/2014 AT 4:00 PM ET
Sometimes kids say – and do – the darndest things. That’s what Jennie Garth learned two years ago when her eldest daughter Luca, then 15, gave her a book for Christmas. The title? S––– Happens So Get Over It.
“I thought, ‘Are you kidding me? I can’t believe she’s so insensitive,’” recalls Garth, whose 11-year marriage to actor Peter Facinelli had ended earlier that year.
The reality of that symbolic wake-up call (now displayed on her living room coffee table) was just what the actress, who’s also a mom to daughters Lola, 11, and Fiona, 7, needed to move on with her life and rebuild her career.
The former Beverly Hills, 90210 star penned Deep Thoughts From a Hollywood Blonde, available this coming Tuesday.
“It’s not a salacious tell-all,” Garth tells PEOPLE of her memoir, which deftly balances humor, honesty, poignancy and a touch of behind-the-scenes insight from her 90210 days. “It’s my journey and an introspective look at things I’ve experienced in my life.”