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Ashlee Simpson and her fiancé, Diana Ross' son, Evan Ross, were seen engaging in sweet PDA moments last Monday in California.

According to Beauty World News, JustJared reported that the couple was seen shopping at Petco and Target in Sherman Oaks , California, last Monday.

Just Jared further reported that the happy couple "kept their arms wrapped around each other and held hands while also grabbing some coffees from Starbucks that day."

Ashlee Simpson news further revealed that the couple plan to tie the knot by the end of the summer.

The pair had planned an eclectic Bohemian theme for the much-awaited event. This bears close similarity to the theme of the couple's engagement party decor, as reported by a source from E! news in June.

The planned wedding date? August 31. The couple will wed at Diana Ross' estate in Greenwich, Connecticut. White lanterns will decorate the tree branches and the walkway towards the altar, as said by a source from E!

Ashlee's future mother-in-law, Diana, has closely involved herself in the wedding preparations.

Evan proposed to Jessica's younger sister in January, after just six months of being together.

He gushed about the singer, saying:

"Honestly, we could go and get married right now, wherever,"

"We just want to be married. We're in love. This is the most incredible time I could ever think of in my life and I'm young, but the same time, I've lived a different life than most and I can't think of a happier moment."

Stay tuned for more of Ashlee Simpson news, as she gets ready to wed soon!