The superstar behind the chart-topping songs "On the Floor," "Dance Again," and "First Love" kicked off her birthday celebration by sharing a photo of her on social networking website Instagram. Jennifer Lopez, who just turned 45, shared a photo of her as she is seen soaking in the bathtub. The photo has somewhat proved that she has definitely maintained her youthful and glowing aura despite her age.

In the photo with a caption that read, "Soaking it all in... #birthdaygirl #itsmyparty #quietbeforethestorm," J.Lo relished a relaxing spa treatment along with her best friend Leah Remini, Christian Post reported. Looking stunning with a strapless top paired with tousled curls, J.Lo shared another selfie as she celebrated with star-studded guests in Southampton.

"Let the games begin! #itsmyparty #funtimes #birthdaygirl #aintnuthingbutanumber," the former "American Idol" judge wrote for her selfie caption.

Following a heart-breaking separation from her much-younger beau, Lopez seemed to be trying to tell the entire world that despite turning a year older, she is still the bomb with her sexy curves, flawless skin, and radiant, timeless beauty.

The fiery Latina rang in her 45th birthday with Hollywood stars, which include celebrities Khloe Kardashian, Bravo TV host Andy Cohen, Kelly Ripa, Fat Joe, Leah Remini, Scot Disick, and French Montana, Daily Mail reported.

Although ex-boyfriend and dancer-choreographer Casper Smart was not able to grace the event with his presence,he made sure to send her a sweet birthday greeting to his former beau on Instagram as well. He posted a photo of a pink bear-shaped cake, which he captioned "Happppppppy Birthday to the most Beautiful lil bear in the world!!!! May all your wishes come true!! @Jlo."

Jennifer Lopez has since confirmed that she already ended her relationship with Smart early this year as both of them grew apart, according to Christian Post. After her failed relationship with Smart, however, Lopez is rumored to be dating with "Dancing with the Stars" veteran Maksim Chmerkovskiy. Both has since denied the allegations.