The 25-year-old, who spent £4k on a boob job, looked amazing in red dress as she became the seventh housemate on this years show.
Speaking in her clip, she said: "I've had a pretty normal life. I'm a peasant, I grew up on a council estate."
She added: “If you can make me laugh then you're in."
Those watching at home took to Twitter to comment on her, with one person writing: “Ok Sian is my fave so far #cbb #BigBrother she has tattoos aswell that’s a bonus.”
Another commented: “Sian is stunning! #BigBrother”, while someone else wrote: “I actually love sian shes goin to be my girl crush of the series #stunning #BBUK #bigbrother.”
Sian already has 6,000 Instagram followers and often shares snaps of herself with her son.
During the live launch, which saw a farmer and call centre enter, Big Brother host Emma promised viewers that the last series of the reality show will be the "biggest and best yet".
As she opened the show, Emma touched on the announcement that Celebrity Big Brother and its "civilian" equivalent will no longer be airing on Channel 5 after its latest run.
She said: "Big Brother viewers. This is Emma. You still have 53 days to say your goodbyes. For one final time on Channel 5, Big Brother is coming to get you!"
Willis added: "As you may have heard today, it was officially announced that this will be the last ever series of Big Brother on Channel 5.
"Our mission for tonight and for the rest of the series is to make it the biggest and the best yet.
"Especially for all of you watching at home and for every single person that joins us in the audience every single week, as you are the people who have kept us going for 18 solid years. Thank you."
She revealed that 20,000 people had applied to be a housemate for the final Channel 5 series, which had been whittled down to the 14 contestants who will appear on screen.
Famous quotes from the show's previous series will adorn the walls of the house during the show's swansong.
Among them is the phrase "Live by the sword, die by the sword" which was uttered by series one contestant "Nasty" Nick Bateman.
Those competing for prize money of £100,000 in the new series also include 31-year-old cleaner Tomasz from London and 23-year-old farmer Cian from County Tipperary.
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