The Big Bang Theory star posted the IG pic, looking lovingly into Alaina's eyes and smiling widely. She had her arm around him.
The 43-year-old captioned the cute pic, "Last night was wonderful. Thank you #jefferykatzenberg.”
Alaina seems to be in love with her new beau as she posted a photo earlier this month, sporting Johnny’s initials on her left forearm and captioned the photo, “Gone country and branded by babe.”
It's not clear when the two actually started to get it on but back in July, she posted a photo of her and Johnny chilling on a beach in Malibu. The lovebirds also attended the Jack White concert at the Santa Barbara Bowl on August 20.
Alaina is 21-years old and about half his age. But that doesn't seem to stop them from showing much social media PDA.
Do you like the two together? Sound off in the comments below!