The 18-year-old model has publicly announced she has joined the social media platform, reported Femalefirst.
The star announced the news by writing her first post, she tweeted: "Just a bit late to the twitter game (sic)."
The blonde beauty also shared the news on Instagram with a picture of her first status.
She captioned the upload: "Just a bit late but hi twitter (sic)."
And within just a few hours of joining, Sofia already boasts 3,642 followers, although she is only following 11 people including her sister Nicole and her former "Simple Life" co-star Paris Hilton.