The singer-actress kept a low profile in sunglasses and a black cap emblazoned with the word 'Hustle' as she left the Studio City fitness centre on Wednesday (23 April).
Ashlee's engagement ring, however, was clearly visible - and isn't it gorgeous?!
Jessica Simpson's little sister became engaged to actor Evan during a romantic holiday to Hawaii earlier this year, and the couple held an elaborate engagement party back home a couple of months later.
And clearly Ashlee is a big hit with Evan's family!
His sister Tracie Ellis Ross recently told E! News: "The thing that I think is really beautiful and amazing about her [is] she has a heart of gold. I swear to God, she's like a mushy love, and she's so sweet."
Evan is the son of Diana Ross and he'll appear in the next Hunger Games movie, Mockingjay Part One, taking the role of TV crew assistant Messalla.
This will be Ashlee's second marriage. She was previously wed to Fall Out Boy musician Pete Wentz, the father of her five-year-old son Bronx.
Celebrities who became engaged in 2014 in pictures:
Copyright: Instagram kayascods