Kevin Costner’s estranged wife Christine Baumgartner buys balloons for her son Cayden in Montecito

Kevin Costner’s estranged wife Christine Baumgartner steps out with daughter Grace as she buys balloons for her son Cayden in Montecito…days after filing for divorce

Christine Baumgartner, Kevin Costner’s estranged wife, bought balloons for her 16-year-old son Cayden’s birthday in Montecito on Sunday.

The 48-year-old handbag designer was also joined by her daughter Grace, age 12, on the outing, and they both carried bouquets of balloons as they made their way across a parking lot.

The media personality’s stock run took place just days after she blindfolded her estranged husband of nearly two decades, Kevin Costner, when she filed for divorce.

Baumgartner wore a patterned blouse tucked into cropped white jeans as she picked up the balloons.

The model wore clear-framed sunglasses and her gorgeous blonde hair cascaded down her shoulders.

Special occasion: Christine Baumgartner was spotted buying balloons for her 16-year-old son Cayden’s birthday in Montecito on Sunday

Family affair: The 48-year-old handbag designer was also accompanied on the outing by her daughter Grace, aged 12, and they both carried bouquets of balloons as they made their way across a parking lot

Family affair: The 48-year-old handbag designer was also accompanied on the outing by her daughter Grace, aged 12, and they both carried bouquets of balloons as they made their way across a parking lot

The designer and Costner, 68, initially started their romance in 2000 when they started dating.

The Yellowstone star was previously married to Cindy Silva from 1978 to 1994, and they share daughters Annie and Lily, 39 and 36, as well as a son named Joe, 35.

He briefly dated Bridget Rooney after his first divorce, and they welcomed a son named Liam, 26, in 1996.

The artist was subsequently linked to several individuals, including supermodel Elle Macpherson.

Baumgartner and Costner finally got married in 2004 and brought Cayden into their lives in 2007.

The two welcomed another son named Hayes, 14, in 2009, and Grace was born the following year.

It was revealed that the former had officially started the process to end her marriage last week.

A representative for the Waterworld star spoke to People and confirmed the news of his union with Baumgartner.

In the past: The designer and Costner, 68, initially began their romance in 2000, when they started dating, and they tied the knot in 2004

In the past: The designer and Costner, 68, initially began their romance in 2000, when they started dating, and they tied the knot in 2004

Proud parents: The former couple started a family with the birth of Cayden in 2007 and they welcomed Hayes and Grace in 2009 and 2010 respectively;  they are featured in 2002

Proud parents: The former couple started a family with the birth of Cayden in 2007 and they welcomed Hayes and Grace in 2009 and 2010 respectively; they are featured in 2002

Over and done with: It was revealed that the former had officially started the process to end her marriage last week;  she is seen with Costner in 2019

Over and done with: It was revealed that the former had officially started the process to end her marriage last week; she is seen with Costner in 2019

“It is with great sadness that circumstances beyond his control have arisen which have resulted in Mr. Costner having to participate in an action for dissolution of the marriage,” they said.

The representative added: “We ask that the privacy of him, Christine and their children be respected as they navigate this difficult time.”

That was later reported by TMZ that Costner was unaware that Baumgartner was planning to end their marriage before the news became public.

The Postman star is said to have been very upset when he heard about the situation.