Cast member Jessica Alba poses at a press line for "Sin City: A Dame to Kill For"
Jessica Alba believes in staying fit through power walks. Reuters

Jessica Alba has reportedly lost a lot of weight. The 33-year-old actress recently shared a photo of herself from her Thailand vacation. In the photo, she is seen wearing a bikini and sarong. Alba is jumping in the air along with a friend, and she captioned the picture, "Jump for joy! #Thailand w my #BFF."

According to Inquisitr, Alba's photo has triggered speculations in regard to her thin body frame. The photos have also generated negative reactions in the media, and it is being said Alba's 'protruding ribs' are a matter of concern.

The actress is known to follow a strict diet regimen. In one of her previous interviews, she has said that she prefers lean proteins and fresh vegetables. "I have the same food philosophy for myself as I do for my kids," she explained to Self Magazine as qouted by US magazine, adding, "We eat mostly lean protein and fresh fruit and vegetables, nothing processed or from a box, if we can."

Alba is a mother to two children, Honor and Haven. However, she likes to keep herself fit. Her fitness routine consists of yoga, dancing and basic cardio exercises. She also likes to go for walks and swims with her girlfriends.

She said to People that she loves to binge on fresh fruit smoothies. Her favourite smoothie blend consists of 8 oz. Zico, 1/2 cup each frozen blueberries, strawberries and yogurt, a banana, 1 tsp. flax seeds. She reportedly prefers the same diet for her daughters. Alba's rep is yet to address the weight loss rumours.

Meanwhile, Alba is currently shooting the sequel of "The Mechanic." The film also stars Jason Statham, Tommy Lee Jones, and Michelle Yeoh. Statham plays the titular role of the mechanic, Arthur Bishop. The sequel is slated to release in September and will follow the storyline of Arthur who has been given the task of three assassinations.

Alba has two more films lined up for 2015 release including "Dear Eleanor" and "Barely Lethal." She is also filming "Stretch" and "How to Make Love Like an Englishman."