Her bump is getting big!

Christina Aguilera showed off her growing belly on Saturday afternoon, posting a full body photo to her Twitter page showing her relaxing in what looks like her kitchen. Sporting a tight long tank, the pop star looked happy and healthy while applying EOS lip balm.

"Happy 1st Day of Summer," she tweeted along with the pic ... along with an additional message promoting the skin treatment line.

Christina recently opened up to PEOPLE about Baby #2, saying "I’m really excited to meet our baby girl. This has been a very easy and enjoyable pregnancy."

Aguilera is expecting her first child with fiance Matt Rutler, who popped the question on Valentine's Day earlier this year. The 33-year-old also has son Max with ex-husband Jordan Bratman.

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