The 'Keeping Up with the Kardashians' star and the 'After Earth' actor - who previously insisted they are just good friends - were spotted ''making out'' at her half-sister Kim Kardashian and Kanye West's wedding on Saturday (24.05.14).
A source told E! News that the 15-year-old actor and the 16-year-old brunette beauty were all over each other at the newlyweds' reception at the Forte di Belvedere in Florence, Italy.
Jaden arrived in the picturesque city alone but returned to Paris with Kylie, her mother Kris Jenner, niece North West, half-sister Khloé Kardashian and sister, Kendall Jenner, via a private jet today (25.05.14).
The couple also spent a few days in the French capital together earlier this week and were seen arriving back at the George V hotel with tubs of Haagen-Dazs ice-cream after Kim and Kanye's extravagant pre-wedding celebration at the Palace of Versailles on Friday night (23.05.14).
An insider told UsMagazine.com that they were laughing and giggling as they entered the lobby together.
The young fashion designer previously insisted Jaden - whose parents are Will and Jada Pinkett Smith - was just one of her ''best guy friends'' and claimed they were not dating in December.
Kylie was one of the few members of the bridal party granted a plus-one.
Sources previously claimed that Khloé was banned from bringing her new boyfriend, French Montana, and Kim's half-brother Brody Jenner refused to make the trip from Los Angeles because his girlfriend, Kaitlynn Carter, wasn't invited.