After all that hard work, Lohan appeared to be stressed out and decided to unwind poolside in a tiny striped bikini with her sister Ali.
But the star's once enviable figure has given way to a pot belly, which she exposed while changing from her bikini.
Lohan, 24, and her 17-year-old little sister soaked up the sunshine on the rooftop of the Raleigh Hotel in Miami, Florida.
But as Ali appeared toned and lithe, the Mean Girls actress looked strained, bloated and in need of a good night’s rest.
In between smoking her cigarette, Lohan sipped on bottled Fiji water and chatted on her mobile while her friends opted for cocktails at the hotel.
While she lounged by the pool, Lohan tweeted: ‘Can’t I just be with my sister @ a pool and have out salad!! Grrr met the sweetest girl whos 17 and has a child.’
She later headed to a basketball game and tweeted: ‘So excited @ Miami heat game! In a box I wish my brothers were here!!!’
Miami Heat were competing against the Chicago Bulls at the Eastern Conference NBA Finals.
Earlier in the day Lohan was having her picture taken for Plum Miami Magazine in a very low-cut silky pink dress which was blown open by the wind, exposing her to onlookers.
Little sister: Lohan's 17-year-old sister Ali joins her at the pool, wearing a strapless bikini and woven hat
Upset: Lohan looks stressed while speaking on her mobile
Plum Miami Magazine is described as a local lifestyle glossy that ‘focuses on wealth, fashion, art, fine dining and travel'.
Meanwhile, as she tries to get her career back on track, Lohan has been rumoured to be one of the names Stephen King is interested in for a possible Carrie remake.
King was the mastermind behind the 1976 original horror movie that starred Sissy Spacek – an abused girl with telekinetic powers.
Hanging out: The actress chills in the sun with a group of friends and her sister
The role would certainly help relaunch her career and last week she won a restraining order against a man accused of stalking her.
The actress said she received more than 100 text messages from David Cocordan, with some leading her to believe he intended to sexually assault her.
He also altered magazine articles to make it appear as though they were dating, sent her gifts, visited her house and followed her to public appearances.
Oops: Earlier in the day Lohan experienced a wardrobe malfunction when a gust of wind blew open he dress