Timberlake's post to the superstar producer also features a throwback video of the two working on JT's 2003 hit "Rock Your Body."
The pop star revealed she misses her brother already despite their recent hangout session.
The rapper previously expressed a desire to receive treatment during this year's SXSW.
"Read the room" a number of Twitter users responded to the rapper's post.
BTS' "Dynamite" was part of the concert's pre-show playlist.
The bride and groom exchanged vows during a short break in the pop star's set, much to the delight of other die-hards in attendance.
Jennie, as well as members of BTS, ENHYPEN and MONSTA X, also attended the concert.
The "Only Murders in the Building" star recently surpassed Kylie Jenner's 382 million followers.
Here are the main takeaways from "The Fight for Artistic Authenticity on TikTok" panel, moderated by Billboard's Lyndsey Havens, at SXSW 2023.
The rapper filmed the video in her native Trinidad and Tobago.
