That’s love all! Serena Williams blows her fiance Reddit co-founder Alexis Ohanian a court side kiss at the Australian Open

The American sports star was celebrating a win over Croatian Mirjana Lucic-Baronir in the women’s singles at the Australian Open Grand Slam Semifinal.

An elated Serena turned her attention to the stands, where her fiance Alexis was watching her adoringly.

The six time Australian Open winner blew her beau a loving kiss, smiling as she looked up at her man.

Special moment: An elated Serena turned her attention to the stands, where her fiance Alexis was watching her adoringly

Alexis looked back adoringly at Serena, as the couple shared the special moment despite the crowd.

Earlier that day, the Reddit co-founder also threw his support behind another member of the Williams clan.

The entrepreneur cheered passionately for Venus Williams, 36, as she triumphed over fellow American player CoCo Vandeweghe in the women’s semi-finals.

Supporting her sis: Earlier that day the Reddit co-founder also threw his support behind another member of the Williams clan

C’mon! The entrepreneur cheered passionately for Venus Williams, 36, as she triumphed over fellow American player CoCo Vandeweghe

Alexis yelled and cheered for the older Williams sister, arms raised in the air after a tense match moment.

The two siblings will now face off against each other for the grand slam title, the first time since Wimbledon in 2009.

Serena revealed she was engaged to Alexis late last month in a Reddit post titled I Said Yes.

Engaged: Serena revealed she was engaged to Alexis late last month in a Reddit post titled I Said Yes

The couple are believed to have been dating since October 2015.

Also taking in the tennis on Thursday was journalist Jennifer Keyte, who appeared engrossed as she watched a match.

The Channel Seven newsreader looked chic in a white top and glasses for the summer sporting event.

Can’t take her eyes off: Also taking in the tennis on Thursday was journalist Jennifer Keyte, who appeared engrossed as she watched a match