A very pregnant Catherine Giudici has been forced to trade in her gigantic Neil Lane sparkler for a temporary engagement ring — and it's all because of her swollen fingers.

The Bachelor winner, who is currently expecting her first child with husband Sean Lowe, showed off her new bling on Instagram.

RELATED: 'Bachelorette' Star Emily Maynard is Pregnant Again — Expecting Third Child

"Rockin' a new one. (Mah fingas are growing too much for my 4 1/2 size Neil Lane)," she captioned the pic of her hands wrapped around a tea cup with a rough cut ring by Blaine Bowen Jewelry on her left hand.

Just a couple of months ago, the 30-year-old reality star was showing off her 3.5 carat cushion-cut diamond on Instagram.

RELATED: 'Bachelor' Alums Catherine Giudici and Ali Fedotowsky Compare Baby Bumps

It won't be long now until Catherine, who is due at the end of June, can wear her hard-earned bling once more.

Check out the gallery below for a look at Catherine's growing baby bump!