Now it’s time to meet the fellow Scientologist love interest who accompanied her to the big bash.
Isabella made a rare appearance at the huge event in Los Angeles on Friday and apparently the auburn-haired celebrity offspring wasn’t too concerned with concealing the identity of her boyfriend.
The man in his twenties is a member of the indie music group, ae (pronounced ‘ay’) with band mate Adam Cude and a source told People magazine that they were ‘together the whole night’.
‘They were sitting together watching the game and sang Happy Birthday to Connor.’
Wearing a navy blue jumper and New York Yankees cap, he could be seen watching on with a grin on his face as his girlfriend’s sibling took centre stage for an interactive computer game.
Although it is not clear how long they have been dating, Frencher seemed to be entirely comfortable with the group of pals, suggesting he was familiar with his lady’s inner circle.
Tom Cruise's shy 19-year-old daughter had her guy permanently attached to her arm at Hyde in the city's Staples Centre.
The teenager is seeing Beverly Hills born Eddie and according to Life & Style, Isabella was happy to go public with companion's identity at the fete.
'She introduced him as her boyfriend at her brother Connor's 17th-birthday party,' an eyewitness tells the magazine.
'They arrived separately. She waited outside for him with a ticket, and then they walked in together.'
According to his 'About Myself' section on OurSites.org, Eddie writes: 'My dad introduced me to Scientology. He has been a Scientologist since before I was born, so I have been a Scientologist all my life.' (so much for those rumour about her wanting to break away from her dad and Scientology - op)
The man of the hour, of course, was birthday boy Connor Cruise, the adopted son of Tom and Nicole Kidman.
The aspiring DJ, who is starting to become a regular of the LA party scene, proudly posed up with his sister at the bash at the Hyde lounge.
And the teenagers were free to do what they want without being chaperoned by Cruise, 49, and stepmother Katie Holmes, 33.
The teen arrived at the Just Dance 3 and SBE sponsored party in a chauffeur-driven Rolls Royce Ghost and had been tweeting his excitement about it all day.
He wrote: 'Can't wait for the Ghost!...
'On my way to @HydeStaples in the Rolls Royce Ghost with @djdwrek @Jonoislife and @WhoisLiam! Thank you @EmpireCLS and @MSECLS!!!! Love it.'
Enthusing about his party, he tweeted: ''Ima make this s**t light up. Waitin till the sun goes down.
'Dope situation up at @HydeStaples right now!!!! This is gettin cray.....'
Crazy indeed, given that longtime friend Jamie Foxx made an appearance to work the turntables.
Connor and Isabella have lived with father Tom since his high-profile divorce from their mother Nicole Kidman in 2001.
Throughout their childhood, they have been home-schooled and following the controversial religion Scientology, just like their father.
In an interview two years ago, Nicole revealed her sadness that their children had chosen to live with their father instead of her.
Nicole now splits her time between Australia, LA and Nashville, Tennessee with husband Keith Urban and their two daughters Sunday and Faith.
She said: 'They live with Tom, which was their choice. I'd love them to live with us, but what can you do?
'They are healthy and sane and together and are great, great people.'
In an interview in 2007, their stepmother Katie Holmes claimed Connor and Isabella called her 'mom'.
She said: 'His first two children are incredible, really smart and kind. They call me Mom.'
Bonus pic from Connor's titter
Read more, twitter
posting this because people say we never hear about the other kids and daily fail's picture captions are too funny to not be included.