United Kingdom, Feb. 3 -- Jessica Biel has opened up about the ups and downs of her marriage to Justin Timberlake -admitting their relationship is "sometimes devolving" in a candid Instagram tribute marking the singer's 44th birthday.

The 42-year-old actress shared a heartfelt post to her husband, after he has been hit by scandals including a DUI arrest, saying: "Another year to make memories that I keep sacred in my heart.

"Another year of joy and challenges being a parent with you. Another year together being curious and creative in the world."

She continued: "Another year growing and evolving and sometimes devolving, with you. Another year laughing about it all. Happy birthday my love."

Justin, who turned 44 on 31 January, responde...