Credit: Christina Aguilera on Twitter

Christina Aguilera is positively glowing these days, and with good reason. She’s had successful singles with Lady Gaga and A Great Big World, she got engaged, and recently announced she’s expecting a baby girl. This week, however, the only birth she’s celebrating is that of her fiancé, Matt Rutler.

The “Beautiful” singer wished her man a happy birthday on Twitter April 9 with this too-cute-for-words Polaroid-style pic of the two of them. "Birthday week for the birthday boy- Lots of love & blessings to celebrate!” she tweets. With her left hand resting on Matt’s shoulder, it’s hard to take your eyes off Xtina’s massive engagement ring, which her hubby-to-be reportedly spent a good year designing himself.

However, despite that stunning sparkler she’s sporting, Christina’s best accessory in this pic has to be the ecstatic glow on her face. Happiness looks great on her, don’t you think?

Christina announced her engagement on the eve of Valentine’s Day, more than four years after meeting Matt during filming for her 2010 movie, Burlesque. Not long after came the news that they are expecting their first child together, a half-sister for her six-year-old son, Max Bratman. Though Christina’s pregnancy wasn’t exactly planned, it seems like she and Matt couldn’t be happier.

Source: Christina Aguilera on Twitter