Christine Baumgartner discount shops at Jenni Kayne in Montecito... after her three children support ex Kevin Costner at Horizon premiere

Kevin Costner's ex-wife #2 Christine Baumgartner stopped by the Jenni Kayne boutique in Montecito, CA on Tuesday - not far from her $40K/month four-bedroom rental home.

The 50-year-old divorcée took advantage of the California lifestyle brand's 20% off statewide summer sale as she browsed racks of discount clothing.

For her retail therapy session, Christine clutched a tan sun hat while wearing a b&w-striped maxi-dress, brown sandals, and a black purse.

Missing from Baumgartner's side was her neighbor-turned-boyfriend - Oaktree Capital managing director Josh Connor - whom she initially denied dating at her divorce trial until their PDA-filled stroll on May 14.

But DailyMail.com spotted the former handbag designer getting close with the 49-year-old divorced father-of-three - who once lent her $20K - as far back as January 12 after vacationing in Hawaii together last July.

Kevin Costner's ex-wife #2 Christine Baumgartner stopped by the Jenni Kayne boutique in Montecito, CA on Tuesday - not far from her $40K/month four-bedroom rental home

The 50-year-old divorcée took advantage of the California lifestyle brand's 20% off statewide summer sale as she browsed racks of discount clothing

'Kevin had strong suspicions that something was going on between Christine and Josh,' an insider told Us Weekly on January 24.

'Their close [bond] was a real elephant in the room.'

On Monday, the 69-year-old Yellowstone alum brought their three teenage children - son Hayes, 15; son Cayden, 17; and daughter Grace, 14 - along with two of his older children to the LA premiere of Horizon: An American Saga – Chapter 1.

Kevin cast Hayes as Nathaniel Kittredge, who defends his family from a home invasion in the opening scene, in the dismally-reviewed western hitting US theaters this Friday.

The avid surfer told ET on Monday that he's looking forward to going on a lavish family vacation next month: 'I think we're going to the Bahamas soon and I'm glad.'

Costner had planned on casting their daughter Grace as the character Elizabeth, but she wanted to be a normal child and didn't want to leave her friends or school behind.

The two-time Oscar winner pays Christine $63K/month in child support to help care for their three children after settling their contentious divorce battle on September 19 - five months after their legal separation following 18 years of marriage.

Kevin - who's denied dating singer Jewel - admitted to People earlier this month that he and Baumgartner 'just weren't able to go the distance' but called her a 'good partner [and] good mother.'

[video_shortcode_video_html_5 src="https://videos.dailymail.co.uk/video/mol/2023/09/01/2941098280322681942/1024x576_MP4_2941098280322681942.mp4" itemprop="image" content="https://videos.dailymail.co.uk/video/mol/2023/09/01/2941098280322681942/1024x576_MP4_2941098280322681942.mp4" data-src="https://videos.dailymail.co.uk/video/mol/2023/09/01/2941098280322681942/1024x576_MP4_2941098280322681942.mp4"]

For her retail therapy session, Christine clutched a tan sun hat while wearing a b&w-striped maxi-dress, brown sandals, and a black purse

Missing from Baumgartner's side was her neighbor-turned-boyfriend - Oaktree Capital managing director Josh Connor - whom she initially denied dating at her divorce trial until their PDA-filled stroll on May 14

But DailyMail.com spotted the former handbag designer getting close with the 49-year-old divorced father-of-three (pictured) - who once lent her $20K - as far back as January 12 after vacationing in Hawaii together last July

An insider told Us Weekly on January 24: 'Kevin had strong suspicions that something was going on between Christine and Josh. Their close [bond] was a real elephant in the room' (Kevin Costner pictured Monday)

On Monday, the 69-year-old Yellowstone alum brought their three teenage children - (from L-R) son Hayes, 15; son Cayden, 17; and daughter Grace, 14 - along with two of his older children to the LA premiere of Horizon: An American Saga – Chapter 1

[video_shortcode_video_html_5 src="https://videos.dailymail.co.uk/video/mol/2023/09/01/2941098280322681942/1024x576_MP4_2941098280322681942.mp4" itemprop="image" content="https://videos.dailymail.co.uk/video/mol/2023/09/01/2941098280322681942/1024x576_MP4_2941098280322681942.mp4" data-src="https://videos.dailymail.co.uk/video/mol/2023/09/01/2941098280322681942/1024x576_MP4_2941098280322681942.mp4"]

Kevin cast Hayes (pictured) as Nathaniel Kittredge, who defends his family from a home invasion in the opening scene, in the dismally-reviewed western hitting US theaters this Friday

The avid surfer (L) told ET on Monday that he's looking forward to going on a lavish family vacation next month: 'I think we're going to the Bahamas soon and I'm glad'

Costner had planned on casting their daughter Grace as the character Elizabeth, but she wanted to be a normal child and didn't want to leave her friends or school behind

The two-time Oscar winner pays Christine $63K/month in child support to help care for their three children after settling their contentious divorce battle on September 19 - five months after their legal separation following 18 years of marriage (pictured in 2019)

Kevin - who's denied dating singer Jewel - admitted to People earlier this month that he and Baumgartner 'just weren't able to go the distance' but called her a 'good partner [and] good mother' (pictured in 2018)