Christina Aguilera shares adorably sexy pregnancy photo

[embed]

[/embed]

OK, so maybe it's an ad for EOS lip balm.

Whatever.

Christina Aguilera Tweeted a photo of herself, pregnant belly on display, clad in a super-sexy blue dress.

"Happy 1st Day of Summer! Keep those lips hydrated!" she wrote.

Aguilera is expecting her second child, a girl, with her fiance Matt Rutler.

She also shared her engagement on Instagram.

[embed]

[/embed]

And here she is, back in April while in Manhattan.

[embed]

[/embed]

As for her gig on NBC's The Voice, that's over for now -- but Aguilera will be back for season 8. NBC shared a first-look at the new mentee-coaches.

[embed]

[/embed]