This has been asked before. I’m betting on a custom typeface. This appears to be a modernized take on 18th-century French copperplate lettering mixed with a little bit of Di Spigna Spencerian. You might enjoy String, Kitsuné, Mommie, or Mommie Brush.
Thanks to a tip from Matthew Smith, we can confirm this is a custom typeface called Candy Darling by Miguel Reyes for Commercial Type.