The 30-year-old "Mean Girls" star slammed Tarabasov and posted his pictures and videos on her Instagram in which the Russian millionaire, 23, is seen partying with another woman.
"I guess I was the same at 23...Time-it changes at 26/27 @e2505t thanks for not coming home tonight. Fame changes people," Lohan wrote.
Shortly she posted another photo of Tarabasov at a party along with the caption, "Wow thanks #fiance with Russian hooker @dasha_pa5h."
The actress then shared a picture of herself on Twitter with a baby bump from her 2009 movie "Labor Pains" and wrote "Lindsay Lohan labour pains trainer - I am pregnant!!" She is yet to confirm the claims.