(Photo by Theo Wargo/GA/The Hollywood Reporter via Getty Images)

Despite Serena Williams' long-standing position as the greatest women's tennis player ever, she still can't escape negative comments about her body and looks.

Williams took to Instagram over the weekend to share her experience in undergoing a radio-frequency skin-tightening treatment on her midsection. She revealed that she's been feeling "self conscious" about her tummy after giving birth to two babies — Olympia and Adira.

"Being ok to take time for myself is something I have always struggled with," the 23-time Grand Slam winner penned in the caption of her honest post.

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"I just wanna cry," Williams stated with an exaggerated facial expression.

Williams and Ohanian, 41, reportedly fell in love in 2015 after the two met by chance while staying at the same hotel in Rome. The duo tied the knot in New Orleans in 2017 alongside star-studded guests including Beyoncé and Kim Kardashian.