Joe Simpson showed some skin in a half-buttoned green leather shirt for a night out at Chateau Marmont in West Hollywood on Wednesday, Aug. 20 Credit: AKM-GSI

Joe Simpson is getting fashionable! Jessica and Ashlee Simpson's father stepped out wearing an unusual outfit for a night out at Chateau Marmont in West Hollywood on Wednesday, Aug. 20.

The 56-year-old donned a hunter green leather button-down with a gray sweater wrapped around his shoulders while out on the town. He topped off the wild look with black pants, matching sneakers and accessorized with a silver watch.

The grandfather of three has been having a busy summer with his famous family, which has included attending Jessica's wedding to Eric Johnson back in July. He will soon be father of the bride once again when his youngest, Ashlee, weds Diana Ross' son Evan Ross. Ashlee — who shares son Bronx, 5, with ex-husband Pete Wentz — recently slipped into a bathing suit to celebrate her bridal shower with Jessica and some of her closest gal pals.

"Evan Ross. Nearly my son-in-law!!" Joe wrote via Instagram on Aug. 16. "Already my son. Blessed." (Joe and Tina Simpson finalized their divorce and ended their 34-year marriage last April.)

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