It's Britney b—h! Britney Spears has been MIA on Instagram for the past three weeks, but she is back and sparking new plastic surgery rumors. Thanks to her noticeably larger chest, which she put on full display in a tiny sports bra, fans are convinced she went under the knife during her short social media hiatus.

In a new workout video, Britney, 35, shows off her seemingly enhanced curves for her 17 million followers, and board certified plastic surgeon Dr. Andrew Miller, who has never treated Britney, is weighing in on her transformation in 2017. "The type of clothes worn can really make a difference," he said of her seemingly enhanced cleavage.

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“First of all, loss of baby fat goes a long way to making the face look different,” Dr. Miller explained to Life & Style. “As to procedures she may have done, Britney always had a slight asymmetry between her eyes that appears improved in her later photos. Also, the lips look a bit fuller and the nose is a little thinner.”

The singer has been in the public eye for over two decades now, so it’s not surprising that the Grammy winner has had to deal with plastic surgery rumors in recent years. She is definitely not the same Britney we met back in the day in her school uniform and pigtails.

But, Dr. Miller added, “Everything does look natural so whatever she has done, it appears to have been done well.” Britney admitted in 2013 that she visits Beverly Hills plastic surgeon Dr. Raj Kanodia. “I’ve had lip injections before,” the mother-of-two revealed to InStyle, though she didn’t admit to going under the knife.

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Britney in 2003 (left) vs. 2017.

But the "Toxic" hitmaker seems to be more at peace with herself these days. “I like my 30's way more than my 20's. My 20's were horrible!” she confessed. “[Being] in my teens was fun, but I like my 30's.” Britney also takes good care of her rockin’ body, especially since she’s performing in front of thousands every night during her Las Vegas residency.

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"I start with 20 minutes of intense cardio — usually running — move on to light free weights, body-weight exercises such as pushups, squats, and situps, then finish it off with a stretch," she previously told Women’s Health. And it sounds like the blonde beauty will have more to prepare for than just her show in the coming months. Sources tell Life & Style that the entertainer is ready to wed boyfriend Sam Asghari. Fingers crossed!