Bristol Palin will have a big role in her sister Willow Palin's wedding.

The 27-year-old said in an Instagram post Tuesday that she "cannot wait" to serve as maid of honor at Willow's wedding to Ricky Bailey.

Bristol shared a photo of the sweet way Willow, 23, asked her to be maid of honor.

Willow sent her sibling a pizza with "MOH?" spelled out in olives and a gift basket containing a candle, nail polish, gourmet gummy bears and other goodies.

"it's official, i cannot wait!!" Bristol captioned the post, adding heart eyes emojis. "#MOH #1."

Willow got engaged to Bailey at Rockefeller Center in New York in December.

She said in an Instagram post Friday that wedding planning had "officially begun," and that she found her gown Monday in Anchorage, Ala.

"Thank you @bateaubridalboutique for making this so easy!" the bride-to-be captioned a photo of herself holding a "I said yes to the dress" sign.

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Bristol and Willow are the daughters of former Alaska governor Sarah Palin. The pair were all smiles in a photo with 16-year-old sister Piper Palin and their dogs last week on Instagram.

Bristol competed on the eleventh season of "Dancing with the Stars" in 2010 and reached the finals with pro partner Mark Ballas, finishing in third place. In November of that year, she appeared on TLC's "Sarah Palin's Alaska" documentary.

Bristol then starred in "Bristol Palin: Life's a Tripp" on Lifetime in Summer 2012. She most recently competed on "Dancing with the Stars'" Fall 2012 All-Stars edition. She was sent home in the fourth week of the Season 15 competition.